I can no longer tell which of my slacks has pending messages at a glance, and my actually important channels' notifications are hidden in a sea of irrelevant ones when they used to be the only attention-attractors on the interface. I gather that you think the list of people and channels is just one aspect of your lovely platform, and we should use the other interfaces like "DMs" and "Reactions" too, but .. that list is the core of your interface, please stop hiding it every time I do anything.