Something that I'd find very useful is receiving a notification when someone has posted in a specific section of a page, particularly for talk pages. On busy policy talk pages it's a pain to use watchlists to determine if anything new has been said in a section that I care about. Watchlisting a page may tell me that there have been 30 edits today on that page but it doesn't tell me quickly if someone replied in a specific discussion that I want to watch. I tried to figure out if Flow will address this but it looks like Flow is mostly about user talk pages. In the future will Echo, Flow, or an improved watchlist system give a user a more visible notification when there's an edit to a chosen section or subsection on any page?