Also books that we bare our teeth at every time we see them on the shelf and quietly chant to ourselves "freedom of information access is more important than the fact that I hate you, freedom of information access is more important than the fact that I hate you - "
Like we have 1.7 million+ items in our collection do you think that a staff of 50 actually has time to even physically page thru or run thru every one of them? If every single staff member were only taking one hour to look through every single book or other collection piece (movies, games, whatever) (which: an hour would NOT be enough even to look at every single part of most of them, but okay fine, an hour), that's still 1.7 million hours divided between 50 people. That's 34K work hours, which at 35 hours a week is more than 971 weeks, aka and that's with all of us doing nothing else, at all.
That would be 18 years just to give each single solitary book an hour, reviewing full time, 35 hours a week, with 50 staff only doing that. And we're a small, single-branch library.
Also also (forgive my tangent, OP) it is as a librarian/information-services professional, honestly, that I will cut you over AO3. As a pure end-user/fan/etc are there things about it that are not my favourite/I wish were different? Yeah, sure.
As a public-facing information professional whose education and preferred career path involves the impossibilities of classification and cataloguing and subject-heading and "community-led collection and program development" and all that shit that is also what everyone at AO3 has to do daily for like millions larger community than I do, I will throw down right here and right now, man. You could literally not pay me enough to take leadership role in a community-led collection for our fuckheaded fan community, I know us way too well. We are worse to deal with than a municipal community, we are literally everything you could point out about the most fractious possible arts community with everyone absolutely sure that their preferred way of doing things is the obvious mass will of the community (while being diametrically opposed to the way that an entire other huge chunk of the community wants) - you could not PAY ME, and it's mostly being done out of love, for free, on a budget a fraction the size of what my (small, municipal) library works with.