I'm not that invested in relationships in my comic just yet since it's not the primary focus of the story, but there is clearly some attraction (and a little confrontation) between some of the characters. I'm still trying to figure out if I want to do more but if I ever do it'll still be a loooooong time from now.
Yeah I have romance in my stories but they aren't usually a focus so... I haven't really gotten to any yet. I wish I had gotten to some sooner but the pacing/amount of content already in place didn't really give much of a chance for it. And sometimes the relationships happen completely behind the scenes (mostly due to limited time to incorporate them 
)
But I do have some shorter stories that do have more focus on romance! Like some of the side stories I wrote for my original True Power series and there will be more in my main comic, Celestial Chronicle Shion, later on.
In the sequel to my completed comic, True Power: MS2, there isn't much romance BUT there will actually be a pairing happening in the next chapter so that's exciting.
AND there will be some in the next chapter of CCShion as well.
It depends on the story and character's commitments.
I have a novel where the man's only goal is to become a good ruler and he will do whatever it takes to get there. He would sacrifice love to become a fair king. So, that novel is a solid level 0.
I have another where the story revolves around a prophecy about a deadly love. The main characters are immortals who understand each other's dark past and together, they struggle to create the life they want. Their relationship almost seems too good to be real and they did fall in love very quickly. This love will be challenged time and time again, but the bond will only get stronger. It's an 'us against the world' type of love. So, that novel is level 4?
The novel I have on Tapas is about two men. Their relationship is a bit odd. One man falls hard while the other one only wants to fulfill the request of his gods. At the moment, the book is at level 1. It may go up to 3.5 (has both elements of 3 and 4).
All this, but fluffy romance is a nono. I make my characters see that love can make or break a person and I always hope the amount of issues are not too much.
There's currently no couples in my comic because we haven't gotten that far yet but once we do I wanna show off all kinds of relationships. I hope I write them alright but it's def a 3-4 on my end.
I think at the heart of it, my novels are actually romance novels even though there's a bigger plot around it. The romance is an integral part of that though and the rest of the plot wouldn't be able to play out without it.
Personally, I love to develop the relationships for a long time so the characters have time to deal with all the problems that arise along the way. For the shorter stories (like, <100k words or something, basically everything that I'd count as 'just one volume') I'd often end with the wedding or some equivalent. For the longer ones with several volumes, there will often be a lot more going down after that as well. Sometimes, that's even just the beginning of the trouble 
Then again, I also had a series where the actual wedding never was part of the main story (despite it being 5 volumes) and only happened in an extra. So maybe it would be more accurate to say that I love exploring the relationships in whatever way fits the specific story and the characters that are involved 
3.5
Romance does play a role however it's not really that sexual and most of it focuses on the anxiety/stress of love. It's weird because I am not a romantic person IRL.
Mostly level 2...some aspects of 3- DEFINITELY a lot of level 4. It depends on the characters and the type of story I'm trying to tell.
Mmmm like 0-1.5. The big comic I worked on through highschool-college had elements of level 1-2 that were going to be included eventually but I never made it that far. The stuff that I've been writing the last few years have been action oriented short stories that take place over the course of a couple days or less so they have fallen solidly into level 0.
In my comic, Romance is one of the main plot arcs. (it's also coming of age and slice of life, and in college, so, the first person they run into isn't necessarily the person they'll be with forever. there will be some shorter relationship as they learn and grow and such).
In novels that I haven't posted here... One is definitely around Level 0, maybe 0.5, discussions about marriage for politics, but she has things to do! One is about a 2.5, romance potential is a subplot - when not worrying about staying alive and catching killers. And then there are two that are Romance Romance. Maybe I should like actually try writing on my novels at some point....
While it isn't something not too bluntly put in you face kind, but it's hinted that R is aromantic, and L is under the asexual spectrum (well, demisexual). Romance isn't their main priority but they love each other just the same.
However, they are surrounded by married couples and those in romantic relationships so their relationship gets pretty much judged because of the society they live in.
4... my characters go there eventually, but I like a slow boil, and unless sex is necessary for the story line I fade to black. Also, as a writer, I focus on the consequences of sex in my stories (and of violence, and of life in general) way more than the mechanics. Example: characters A and B have sex... how does that affect them? Are they closer? Further apart? Did it cause chaos, or gossip? Is it breaking things or helping them? That's what interests me as a reader and as a human, so that's what I write about too.
I have nothing against the hotter stuff, and I do enjoy reading it if it's well written, but I generally want sex in the stories I read to have a literary point other than porn.
2 definitely a 2.
I'm the weirdo that thinks horror and romance mix, nothing like gazing at your beloved over a gruesome murder to deepen the relationship. My main couple is the definition of a slow burn, they won't start dating till the sequel. Their relationship will turn sexual in time but I'm sure it will happen in the background or have a short metaphorical paragraph to describe it. Romance isn't the main focus of my story but it does give a bright spot in an otherwise bleak universe. In a world filled with eldritch monsters and uncaring gods all we have is each other.
Obviously since my main comic involves 14-year-olds, I can't do a 4. Or maybe even a 3.
In any case, most of my characters have hangups when it comes to the opposite sex, and I do have the occasional cute scene, so for this setting a level 1 is good enough.
0-4
It really ranges based on the story. 
Romance is only the subplot for my novels (typically). Sometimes it's not necessary, so I don't even have it (like some of the zombie stories I'v'e written). Others explore the relationship in a more down-to-earth fashion - so no cute, fluffy scenes! 
Also most of my characters are adults, so I tend to focus on other aspects of their lives like commitments, duty to the country, betrayal, etc. I personally find that more interesting than romance.
4.
Like you said, you're writing stories about people. So by nature, romance would have to come up. At least in glimpses. I mean, why else are Romantic Comedies so popular? Heck, even the staple characters that belong to my fictional universe of comics, who are fruit ninjas by the way not even human, enter the world of romance. In fact, there are relationships within my comics that have been set in stone already. To my final point, if relationships are brought up at all, and aim to be fully fleshed out, it should suit the creator to explore all stages of it including sex, marriage, breakups, casual flings, long-term flings, will they/won't they relationships, etc.
