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Because the software that makes him most productive doesn't run on non-Apple hardware?

I doubt that's true. Adobe CS has been the top choice for pro media for years and it runs on Windows at least as well as on Mac.

Final Cut Pro is Mac-only

FCPX is a neutered shell of what FCP once was. It works fine for prosumer YouTuber sorts of things, but it's hardly a reason to cling to macOS.

It depends a lot on what specific aspect of media you're in but this isn't necessarily true. In video there's a lot of Avid, Davinci Resolve and RED, in photography (particularly fashion and very high end) there's Capture One Pro, in music there's ProTools and the like.

Adobe competes everywhere and overall it's very successful but there are a lot of niches where it doesn't dominate.

Just about everything is available on PC as well though so your point still stands. The main exception is Final Cut Pro, which is very popular with video folks.

Changing OSs is also a big time sink.

Read the article (point #4). He explains why.