Forums can definitely see some improvement. I want to subscribe to certain subforums and threads, and get all the updates in a single app (like with a RSS reade

Forums can definitely see some improvement. I want to subscribe to certain subforums and threads, and get all the updates in a single app (like with a RSS reader) without having to visit each forum. IRC got this right. Reddit was okay, but all your content is still beholden to a single platform. Widespread use of "Log in with Apple/Google/FB/whatver" can somewhat alleviate the signup burden, but also introduces other issues like privacy. I for one don't care about signing up to random websites. Modern password managers make it almost a non-issue if I forget my credentials or one of them gets hacked.