In the context of Discourse, “infinite scroll” is really just an implementation detail that helps mostly with performance. Consider this: given you have a page with a few hundred topics/posts, the app could in theory just chuck all of them onto the page, which would technically just be a very big page rather than “infinite scroll”, but in spirit they’re the same thing.
Edit: But maybe a lower-effort way to offset this would be to offer a site setting that bounds how many topics you have in Latest, Hot, etc.