The half-baken "Flat UI" trend in Windows or the telemetry does not really concern me. Really, it is no deal for me and my colleagues. Embrace, Extend, Extinguish? Oh come on. I'm far more concerned about Microsoft losing against other players. That's the world you should be afraid of.
The best thing about Windows though is Visual Studio. The general consensus is, that it's slow, clunky and hard to use. But actually, that tool is so utterly powerful, streamlined and deep, that every other development environment I every used is missing something of its glory.
And I also love Linux in some ways. I used all different kinds of distributions, either through dual-boot or through Virtualbox, but actually the only thing I really use it for is server-side web-development. And well, what can I say. I love the server side applications. But all those arcane commandline wizardry and the configuration madness still irks me now and then.
But well, to return on topic: It's clear that I mostly work with clients, which mainly use Windows. And there is a lot of software written for Windows environments which can probably never be replaced by other software running on Linux. The thing is, that the push of Microsoft to cross-platform .NET Core or even cross-platform UI (MAUI) opens up those applications to other environments. I'm not fully convinced, yet, but we'll see.
Sorry, for rambling. Just my thoughts.