it’s easy enough to remove/hide a DM/Chat from the DM section but 100% agree that being able to add/remove members from a channel would be very helpful.
If I want to spin up a new channel for a few people, especially if its a private one, I don’t think there is an easy way to do it. I -think- the only way to do it is to first create a category, hide that and then add people to it. Ideally you could do everything from chat.