@Matanya reported that, since converting his talk page to Flow, "people came over to complain they can't follow the page anymore"
I tried & was able to watchlist his board. I can see entries in Special:Watchlist: 1 about changing the header, 2 about both of the topics that have been created there.
However: I don't see anything about the replies. One has to manually watchlist topics to see changes inside topics (like replies).
IIRC, we did so because people were complaining about notification spam for every new reply in a board they're watching.
Does that also apply to Special:Watchlist, or do we still want to see everything (including replies) on a board you're watching, even if you don't go out and subscribe to the topic?
Another curiosity: in Special:Watchlist, if there are multiple things about a topic (new-topic, replies, ...), we'll only show the last one. I'm also not sure if that's still something we want.
It looks like data is missing. And if people really want to see less entries, we support grouped RC.