Well I also do not really know the legitimate use case for infinite scroll (other than trying to push gambling/slot-machine tricks onto your userbase).
I get lazy-loading for pages that contain a ton of media of which the user will likely only see a fraction. But some people seem to think infinite scroll is a good idea with text based content as well..
I'm specifically cranky about MS Azure Devops and how much lazy-loading and unloading of text it does. It's basically impossible to ctrl-F.
Also Github. Doing a review or searching logs is pain.
Yes! I suffer through this daily. It's atrocious.