The fact that topic replies are presented sequentially and not as nested threads makes large topics downright miserable to navigate, and responses almost impossible to follow. And I will die on this hill, I don't care how many grizzled old timers try to tell me this is better. I'm not a zoomer who doesn't remember the internet pre-2010, I've been here since the '90s. I know exactly how bad it was, and the better UX is a massive part of why Reddit largely replaced these old communities over the last 15 years.