This makes me wonder if we're having a conversation about "love in a story" or "a story based on love". Look at "Tuck Everlasting" vs "The Lion, The Witch, and The Wardrobe" - one of these things is not like the other coughcough
TE is clearly a story that centralizes around love, life and heartache.
TLTW&TW is first and foremost a story of discovery - discovery of self, of world, of faith (because that's a topic we're stuck with always).
Both involve love in very different ways but I think they can fall into two bunches if we're looking at "Is it a Romance Genre or not?" TE is. TLTW&TW is not.
The distinction between "what it is" is actually why I don't really go hardcore into "Romance" genre as a whole. It's got lots of tropes that just pad the runtime instead of adding to the plot. Now, I wouldn't normally say this, but consider the super mega popular novel Twilight (forget the sequels): It is a story that dances the line between the two novels I listed above, it's both a story about love and life, and a story about discovery. Which is it more? Sequels would say it's "love and life" and toss the book into the "romance bin", and we can go home. Ignoring the sequels however makes it harder to place. (I haven't read the book.) But it's figuring out the lines drawn between "genre" and "categories" and "story" that make this a hard conversation.
I recall a panel about "love in anime and manga that's not hentai/yaoi/yuri" and two stories popped up - Sword Art Online (because it was current) and Fruits Basket. If you look at just the anime for these both (so no manga 'truth' and not light novel 'what author meant' BS floating around) and you get a similar comparison of TE vs TLTW&TW. Furaba is the story of love and life, while SAO is the story of discovery.
The only real stories I engross myself in that are anywhere near the "romance bin" are ones that involve psychology. coughs more "Ten Count" is a manga (yaoi) not for kiddies, but it's heavily steeped in psychology. Gravitation is a BL (not yaoi) that's largely not steeped in psychology, but instead argues "life and love" as the forefront. I studied a lot of character development, story crap, and psychology in college and one thing that was fun was taking Aristotle's views of love from Nicomachean Ethics and applying it to stuff I'm either stuck reading, or choose to read. Gravitation, like the anime FREE!, can become a treat of psychological candy if you allow it to. Don't understand why Kyou (Fruits Basket) is as angry and stoic as he is? Apply psychology, especially as you get a glimpse of his childhood. Don't understand why Shuichi is so driven and excited about life while his boyfriend is extremely negative and terrified? Look at how they grew up and their friends and family.
...Anyway I realize this has gotten to be a long post. IM SORRYYYYYYYY. I just noticed the conversation was veering toward "romance in a story" vs "romance is the story".
[For the record, romance is second-fiddle to pretty much all of my stories, so slow burns there shall be because other shit is happening. Can't fall in love when you're worried about your parents gone missing!]