More Terrible Slack Setups

I find Slack to be a necessary evil. I guess we have to use it, but it can also generate a lot of mental overhead tracking what was said in what channel. This got me thinking, what are alternative ways to organize Slack? What are the worst ways?

- No channels allowed, only direct messages

- No direct messages allowed, only channels

- Only channels which contain all the permutations of N people and are randomly named

- Only one channel, no DMs, everything happens in threads

- Everyone can create only one channel at a time

- No private channels