Because it means Linux is gaining enough credibility as a desktop operating system for PC and parts manufacturers to work harder to ensure compatibility.
Everyone seems to want off the Microsoft upgrade train. Consumers don’t want to constantly fear that the OS will stop getting security updates because Microsoft doesn’t want to make them anymore. Manufacturers of PCs don’t want to pay the Microsoft tax. Parts manufacturers know it’s actually easier to write drivers for Linux than it is for Windows.
But until Linux shows signs of being a credible and attractive alternative, it’s not going to break Microsoft’s stranglehold on all three.