In the past once you clicked your notification box, all the unread notifications were immediately cleared (i.e. became read).
Although this definitely was not comfortable for someone who receives dozens of notifications, there are people that do not attract the same amount of activity or generally just read all the notifications at once after the first click - that's me, for example.
This means that I have to have one extra click to clear all notifications, or probably some moar than one extra click since I often forget that new behavior, close the inbox and have to reopen it again to dispose of intrusive red numbers.
Proposal: make an option for auto-reading all the inbox once it's opened (i.e. introduce an optional behavior that was default prior to inbox improvements)
Oops, it looks like the top answer from the thread i linked contains the same request… lets hope it gets more attention then