In my experience, musicians and other creative types care first and formost about getting results. So that means they need a toolchain that is flexible and rich enough to yield great results. Performance is a factor there, inasmuch as it constrains results.
The toolchain part is pretty broad: this includes OS services (audio routing!), outboard hardware, DAWs and video editors, and third party plugins.
When comparing macOS vs. Windows for audio, macOS wins for most people on those axes. Apple wins on OS services (audio routing is super annoying on windows) and on outboard hardware (USB3 works okay, but Thunderbolt is better, and it's a pain to get configured on a Windows machine). DAWs is mostly a wash with the exception of Logic, and third party plugins is a total wash.
Even given that, Logic plays a strategic role in that ecosystem for Apple. As the more expensive option, Apple always runs the risk of being the secondary platform for application authors. Without Logic, other DAW vendors could be free to neglect their offerings on Mac. That ecosystem is healthy right now, but Logic is a key hedge.
Oh, and lock-in is a big thing, too. Logic users may be a minority, but they're firmly locked into the Mac in a way that Reaper users aren't.
Video is different. Many video creatives have made the switch to windows. There were two key reasons they have jumped:
1. Hardware. The Mac Pro was neglected for years, and third party graphics card support has always been better on Windows. Performance isn't paramount, but it does matter.
2. Final Cut Pro X. This completely changed the editing model from under a lot of pros, requiring them to completely rethink their workflows. Since this happened at the same time that hardware support was really bad, a lot of pros thought, "Well, if I'm going to have to rethink my workflow anyway..." It loosened lock-in at a time when the other parts of the platform were pretty weak.