Flag threads to watch

I know I'm not the only person that wants this, but maybe there aren't enough people to make it worth it: comment pagination. You can't check up on your comments after the most recent 20. While many people probably don't care about following up on their comments, there are plenty of us that are engaged in discussion with people and want to be able to check up on replies.

If we can't have a longer comment history, can we get a way to flag threads under our profile to watch them? Or are we just supposed to bookmark them. Feels like it's asking a lot for something that seems so common in other comment systems.