pretty sure porn has been at the core of imageboard culture (and heyuri, considering there have been porn boards in the past) for a long time, no? in fact, there are rumors that much of the porn posted on heyuri is posted by the same people who make the most OC
and thanks to rule 7 and 8 and such, we don't have to deal much with the same flavor of shit threads that every other chan does. reddit/discord-level posts and threads get deleted on sight, too. heyuri isn't ur average imageboard, after all
so I think you should just ignore the porn threads if you really don't like them. good threads without porn don't really get derailed when someone chooses to post it, so I don't think that there has to be forced segregation or anything. besides, I think having the freedom to post porn wherever and whenever you want makes up part of heyuri's carefree, whimsical nature to begin with. banning porn would make us LESS carefree, if anything. if you dislike porn in general that's fine, but banning it is just silly
so in short, don't worry, heyuri's gonna be okay