+1 for Categorized.
Given how easy it is to create lemmy communities and throw content at them, why not aim for being organized? Have clearly defined communities waiting for the content to pour into them: Human-drawn Hentai, AI Hentai, Photos from porn into categories, AI generated porn fetish by fetish, etc… Nobody is yucking anyone's yum, and everyone can sub or block what they want or don't.
This "mixing" debate is happening in every medium. Should AI generated content be mixed in indiscriminately, or should we welcome it but into it's own channels? AI art with hand-crafted human art? AI poetry with human poetry? Someday they'll be indistinguishable, but until then, let's let each member choose.
Does lemmy support labels (yet)? On reddit that helped having all at one place while filtering for personal preference. I think this would be ideal to prevent many small (thus mostly inactive) communities, although they mostly share a lot and only differ in details.