Comment by mindslight

Games could clearly be an exception - they're the only place the locked down computing paradigm has a reasonable argument.

The multi-user productivity apps you listed would most certainly be better off as separate clients and services! The entire point is that you shouldn't be forced into using one (often terrible) piece of proprietary client software simply due to the network effects of other people using it. Wouldn't it be nice to use the Slack client in a Teams environment (or vice versa if that's your thing) ? This would produce more competition because companies would have to develop the client software to be compelling itself, rather than relying on the pull of installed deployments with captive victims^wusers.