- introduce telemetry
- introduce unnecessary updates and remove the ability to choose not to install them. security updates are fine, feature updates that break things but are only temporarily avoided are unacceptable.
- remove theming. I would not remove the ability to use the themes my designers had created over the years.
- introduce a "Settings" app that fragments the OS configuration (especially if my operating system already had a weird second settings menu that you could only get to by running a command like, for example, `msconfig`).
If I did do these things, I would probably introduce them in a beta operating system and continue to support my flagship product because it would, in this hypothetical scenario, be much friendlier to the average user (whom in this scenario I target).