[jemmyw]

I personally wouldn't try to sell Linux to anyone and get them to switch. It is a futile game and I see no real reason for it. People will move if they have reason to (in any direction) and the best one can do is show and tell. I will tell people what I like using if they ask. I'm more likely to tell folks not to switch because I don't want to be technical support for anyone outside my household.

I don't think anyone will switch from MacOS to Linux because of rounded corners. If they're really into theming it would make sense.

Being able to fix things is also a bit of a vague statement. You can fix things in many different ways, and you can fix some things in every OS. Fixing might be writing your own code, or switching a theme, or an application, or a distro, or the whole OS. The level of lockdown then matters. MacOS has the greatest lockdown because you can't just get a new Macbook and fix it by installing something other than MacOS.