Discussions don't appear in notifications
This is almost a year old so I'm not sure if they are aware. But, it's impossible to know if someone responded to a comment of mine, because it doesn't tell me in the notifications anymore. It hasn't for a really long time, but I think it's a really important part of the website that should be here.
Like if you respond to this, I won't know until I go all the way back onto the discussion. It doesn't just send me an alert.