This is so anglo-saxon to be individual channels for ramblings. We have group wide channel. It's supposed to be social - no pressure to post. Lurkers welcome. Just share. Naturally, some are more talkative than others. The idea is to foster a group/social culture - not have atomized diaries about individuals.
Every place I’ve been to has a dedicated “random” or “off topic” channel and it’s where all the good team building happens. There are usually a few more narrow channels for specific topics (video games, music, pets, food, etc) which can help if there are big personalities that dominate a channel.
It can be intimidating to join in when you’re new though. You got to lurk for a while to read the room a bit and learn the culture.