It's funny how a lot of cishet creators think LGBTQIA+ representation means "Put one character who is gay in your work and make a fuss about them being gay to earn points"... funny and also kinda sad?
Like... there are so many options, and that's how it's not implausible to have a cast or a group of friends who are all some flavour of queer.
Yes, there are people who are cis gay/lesbian, like me, who are comfortable with their assigned gender, but have a strong attraction to people of the same sex/gender...
But there are also bisexuals and pansexuals, who might be just attracted to anyone who's their sort of type, and by the way, if you've ever been attracted to a nonbinary person (like Sam Smith or Lil' Nas X, for example...), you're technically bisexual yourself. Or some of them lean strongly towards one gender, but are open to sometimes being into stuff outside that. This group is so nebulous, it honestly makes people who insist they're 100% straight the anomalies, like... what, you've never looked at a really gorgeous person of the same gender as you or ambiguous gender and thought "wow."? It's a sliding scale, peeps; very few people are actually 100% heterosexual, and people who think they are, it's mostly social conditioning; you're statistically probably at least little bit bi, but scared to acknowledge or express it because of the social backlash of "being gay".
And then there's the trans umbrella. Being trans doesn't always have to be like... Changing from one gender presentation to another and employing hormones and surgery. Trans can include people who just don't quite feel like "man" or "woman" fully describes them. You know who fitted this description perfectly? Celebrated Vampire book writer, Anne Rice (Who never used the word "nonbinary", but... well, just watch the interview). There are lots of "She/they" and "He/they" people in the world who present as their assigned gender on a daily basis, but also... kinda don't 100% feel like that fits them, and they're still recognised as trans nonbinary if they want to be. There's this whole misconception that nonbinary people and nonbinary characters must be perfectly androgynous looking and use exclusively they/them pronouns... but like... nah, most nonbinary people I know, you wouldn't know unless you knew, and they might only ask you to use they/them if they really trust you, so if they think you're kind of... a judgemental asshole who says things like "UGH why's everything got to be GAY nowadays, why can't people be NORMAL?"... they might not have told you?
There are actually a lot of NB characters in anime and manga who are given a gender in translations. In Japanese, it's pretty easy to refer to a person with neutral or even no pronouns, and there are a number of characters who are never referred to as "kare" or "kanojo", but only using neutral terms like "aitsu" or by name (Hange in Attack on Titan, for example, or Piccolo in DBZ). Sadly a lot of translations just drop a "he" or "she" (or language equivalent) and lose this.
Then there's Intersex. Which people incorrectly think just means "having both genitals" but it's way more complex. A lot of people have weird chromosome combos, or some people can think they're just "male" their whole lives and discover they had a womb the whole time when getting surgery for something else, for example.
And finally... the ace umbrella. The classic Asexual is a person who experiences no sexual attraction. But there's this interaction between Asexual and Aromantic. Aromantic (Aro) people don't experience romantic attraction, they're not interested in cuddling and being all "I love you".... but they might not necessarily be asexual. You can be just one of these or both. Romantic (straight, bi. pan or gay) but not interested in sex, or Aromantic and not interested in sex, or Aromantic, but enjoy sex (straight, bi. pan or gay). And some people consider "demisexual" (attraction to people only after building a strong social or romantic bond) to count as a type of Ace.
When you look at all those options.... doesn't being a person who isn't even a little bit outside of the "all my sliders are set to 100% cishet sexual and romantic" feel like kind of an outlier? And never mind that, an entire group of people ALL having all their sliders set that way? Like really? A group of ten people and not one of them maybe likes to have sex, but has never felt an urge to settle down and marry somebody? (Aro) Not one of them has never quite felt comfortable with being called "male"? (Nonbinary), Nobody's ever got drunk at a party and started making out with somebody of the same gender? (bi/pan).
The reason so many zoomers are now LGBTQ+ (in some countries it's gone up from 3-10% to 30% in the last 10-20 years) is that the social backlash for being queer is ebbing away, and it's more acceptable for people to openly admit "You know... I wouldn't mind kissing another bloke", or "I've never really felt comfortable calling myself a woman, I kinda think I'm just a person?" or "I'm just... not that into sex, honestly". A lot of people are LGBTQIA+ and stay in the closet their whole lives because of fear of what society or their family will say, so it's not surprising that in comics, creators want to depict a world where like.. everyone can just openly express themselves. But also... once you learn just how broad LGBTQ+ can be... it starts to just feel weird to imagine a group of people who are all cishet, because once you're in friend groups of countries or industries where it's accepted, you'll almost never find yourself studying or working in a room full of them. Media where the entire cast is meant to be cis and straight starts to feel unreal and you start to wonder "okay, so who's in the closet?" and it raises questions about the society those characters are living in. If Konoha is such a nice place to live and worth defending...why does nobody there feel comfortable being "out" about their sexuality or gender? Feels kinda scary and oppressive... 
(Also sorry but also congratulations, anyone who realised they're actually LGBTQ+ themselves reading this post.) 