When you cap, you don't see any upvotes you get on your profile, therefore, you don't have any update on how your questions / answers are doing unless you look at them manually.
Capping the 200 daily rep is not a reason to stop posting here so could I get notified somehow that my posts are being voted on ? Maybe put a little
+X in a different color letting me know that I got these votes but I won't get the reputation for it.
I can go and see in my reputation feed inside my profile and see it :
So I don't see why it wouldn't show up in the feed above.
Maybe putting the feed button green without any
+X just like when you aquire a badge.