It’s nice being Tumblr Old and having some recollection of the self-identifiers we used before this website. The slogans alone should tell you the motivators behind using “queer” as opposed to other terms. There was “we’re here, we’re queer, get used to it!” There was “queer rage”. There was “not gay as in happy, but queer as in fuck you.” That last one especially shows rejection of any neat essentialist boxes – go away with your binaries, your easy categorization, and last but not least your respectability politics.
I’ve never seen “q slur” used before Tumblr, and even that only in the last maybe two years. I’m not playing the whole “you kids turn everything into a trigger” game, that’s not the point. My point is that almost uniformly older LGBTQ+ people on this website associate “queer” with empowerment, and it’s teenagers and early 20-somethings (who are almost the same age group as me, I’m 27) constructing this idea that it has always only been a slur, that it’s more prevalent than any other slurs still in use, and that this is somehow the “historically correct” view of the term and everyone using queer is ignorant of history. Which is just not true.
So anyway, here are some great functions of “queer” that aren’t replicated by any other term:
1) Wide relevance. Queer can be related to gender, sexuality, or both.
2) Opacity. It can be a stand-in for some other term (gay, bisexual, trans, etc), or it can actually mean something else altogether! Something that isn’t fully covered by any of those categories!
3) Queer could, therefore, actually function as an umbrella term (yeah, I know I can’t get away with that in the present climate, thanks for that). Calling everything gay, as has become the norm on Tumblr, isn’t only sticking it to The Straights ™; it’s also sticking it to all the LGBTQ+ people who don’t identify as gay specifically (not to mention straight trans people), and who never see ourselves brought up in casual conversation anymore. It’s back to “gay rights” style language.
And you know what, of course it is, because “LGBTQ+” and other versions of the abbreviation aren’t catchy. “Gay” is catchy. “Queer” is catchy. But for some reason, gee I wonder why it could be, “the community” has decided to eliminate precisely the term that does actually by default encompass a wide range of identities. And replace it with one that again gives primacy to “gay” as the default descriptor, as if the rest of us just don’t matter or should be happy with being “obliquely included” (that is to say, erased). We’ve come up with all this specialized terminology for gender and sexuality, but when it comes to being actually talked about aside from specifically describing yourself in an intro to your blog, it’s underused.
I could go on about how targeting “queer” disproportionately affects MGA and trans/nb people, including people with multiple marginalizations, who especially are likely to have a problem with all these discrete one-dimensional categories and feel that “queer” expresses something the other terms can’t. But that’s already covered in the OP under good old respectability politics.
TL;DR: You can’t just take away a term that many, many people in the community have been actively using for decades before your latest iteration of SGA discourse and expect no meaning to be lost or broken.