When reading a topic and reaching the end, Discourse has always had a list of 5 or so “recommended topics” to go to next. It’s usually topics I’ve looked at before that have new posts plus a few others.
That has disappeared on my iphone, but I still see it on my iPad.
We often get new accounts needlessly bumping years old threads and I think that is at least partially due to this feature, so maybe it won’t be terrible for it to be gone?