If I see my karma go up, that usually tells me that someone may have replied to something I said. Otherwise, I'm glad there's no alert for new replies. Conversation should be intentional. If I'm gonna be reading what someone said in response to me, I better already have enough motivation to check back and see if someone replied. When I don't check back, it's probably because I've got something more important to focus…
I have thought for some time that votes should come in two flavors. X if you make a comment, X/10 if you don't. Drive-by voting is of little value, and for abusive posts that need downvoting we have flagging to accomplish quick removal. Giving more weight to people who write a reply would encourage more conversation. Of course, then there is a question of whether it would encourage more thoughtful comments or not, an…
That said, I'm not asking for notifications on upvotes (like Stack Overflow does)
I'm asking for the basic functionality of all internet fora I've interacted with for the last close to 30 years that tell you if you have any replies