does it exist?

i imagine the search functionality could/would be a mess given the immense number of people involved in productions.

the key feature of MangaUpdates i want is the "tags/categories" system—i pretty much only ever find new manga via tag searching and never* through "genre," which is the standard (and appears to be the only) way movie sites i've seen work. genres are just so vast and hardly granular enough to really be useful.

am i missing anything? a brief survey didn't turn up much, although I was on my computer browser and there seemed to potentially be some tracking apps.

note: the tags should be community-applied-and-voted, not just things you can use on personal lists

*note:

except to eliminate the more clears throat adult genres

IMDb has categories, but Idk about tags.

[color=blue]MILESTONES[/color]
1st: Death Note

The closest I can think of is Letterboxd which I also feel like has the most dedicated film buff audience. They're not across the site, but you can curate your own tags and in-turn search through other people's tags and such. There are genre categories but like you mention those can be too broad and unreliable.

✨~* ~ * ~ * ~ * ~ * ~ * ~✨

If you want tags/genres. I recommend to use MyDramaList. But they only provide Asian shows like Korea, Japan, China.

IMDb has user votes "Plot Keywords". They are badly implemented as the categories here but they exist. You can search them.

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb