Good luck getting multiple different sized monitors to work well out of the box (e.g. laptop + external) on Linux, sometimes even with tinkering you are left with subpar scaling on one. Mac on the other hand just handles whatever combo of monitors and resolutions you throw at it with nothing that you have to do on your side and has done so for a decade now.
Things are much more likely to eventually break if you use an installation too long - I rarely have issues with 5+ year old Windows but most distros don't even support that, and even if they do good luck getting through all the upgrades without having to tinker. Hell, I have to manually mess with PPAs at least once a year just to apply updates.
There's also just too much choice with so many of the options having drawbacks that are hard to distinguish between, especially for non-power users.
There's a ton of other stuff like that that we Linux users are used to so it's not too bad for us but that cause so many people who get a linux machine from a friend to eventually just pay for a Windows install on it since they can't deal with it..