I think the apps and the web ui should increase the size of the users avatars and make the username a bit bigger so it’s easier for people to start recognizing eachother and grow a sense of community. Back in the forum days people would remember eachother’s usernames/avatars for their contributions and it would be easier to grow a sense of community making things less hostile and easier to create community events
Since you mentioned "forum days", I'm still wondering when did we decided we should get rid of those blinking gifs with our usernames we used as a signature for every post! I hate them, but I also miss them...