My guess would be they’re refactoring or removing a dependency or changing a security model that would require them to update legacy driver code and rather than do that, they’re just sun-setting that stuff.

Microsoft would need some advantage to even touch it enough to remove it, risk is still risk. And they’re not exactly in the business of selling much hardware these days. If it were cheaper and less problematic to leave it alone, they would have left it alone, that’s how it’s been there for decades.