I guess where I am coming from is that if I open a topic with 500 posts that I participated in, there is no trivial way for me to see all the replies to my stuff or tell visually where they are. What parts of this big timeline matters to me?
I can filter the stream down to “my posts” but still need to do a reply expansion for every post of mine which can take a while if I post a lot.
That said, maybe long term we should carry 2 notification tables, one with rollups and another without and have the non-rolled up one in the user profile under notifications. (and possible expansion in header)
Any solution I can think of for this problem is not easy at all.