The problem is, they don't run macOS. And if your whole work-environment is centered around macOS, it is not an easy choice to leave that behind, and consequently, hardware upgrades don't come cheap.
I'm in the middle of producing a 17 song concept album. If I switch platforms, I have to completely redo all my mixes and learn a whole lot of new tooling. What's the cost of that? Dozens of hours of my time...
You responded to a different point.