It's not even just an annoyance in the having-to-click-between-tabs sense. It makes channels nearly useless because everyone is normally in the chats tab, so no

It's not even just an annoyance in the having-to-click-between-tabs sense. It makes channels nearly useless because everyone is normally in the chats tab, so no one is keeping up with what's going on in channels. Meaning the only way to get people's attention is to noisily ping everyone, which most people don't want to do so barely anyone posts in them.