As others have said it breaks findability, default browser nav (back then forward again you have to start over or watch it gracelessly attempt to autoscroll back down 600 posts and often fail), renders the scrollbar visually near-meaningless, detrimental to performance, and seems to largely be utilized just to maximize scroll time on visibility driven ad platforms, like all popular social media.
What do you like so much about it? Just the miniscule added convenience (that happens to be weaponized against you anyway as stated above)?
I would prefer my main feed on Twitter to be infinite scroll.
Pagination can be "weaponized" too -- note the awful publishers such as WebMD who break articles up into a billion pages, to increase pageviews and hence ad impressions.
Incidentally I prefer pagination for taxonomy pages and search-results pages, because it puts navigation more in my hands.
I have yet to use a service where I prefer having infinite scroll. I always prefer having pages.