if discord launched a business version slack would be gone in a weeks time. not sure why people can't use IRC anyways unless they have ADHD when their screen isnt full of random colours and pictures and cant work without it
I mean, thread replies in the main conversation by default? Come on.
Personally I'm a huge fan of this and I hate Slack's threads, it's where discussion goes to die. If you need to break off then just create a group for the people who need to have input and take it out of the main channels. I use Discord replies almost daily while I avoid Slack's threads like the plague.
Also the spread of Teams has proved that the product can be... bad... and still used by everyone because its free or bundled with something they pay for.