Microsoft seems to have tried to unify their developer story in many incarnations now. So my biggest question is, why will this one succeed where others have failed? I see absolutely no evidence to suggest this is better than previous attempts.
There's still lots going on in the commercial / enterprise space, but that stuff is either old and Win32 or new and in the browser.
Who is using UWP?
So if you are using pure old style Win32, you will be using a view of the computing world stuck in Windows XP.
That's kind of what I was getting at when I said the Windows ecosystem (excluding games) is moribund.
For the record, I'm a Windows desktop developer. It's a great place to make a living, I just wish there was a little more vitality here on the consumer side.
On MacOS an independent developer (or small shop) making great software can still sell it at $50-$100 to enough people to make a living. For some reason it's harder to do on Windows even though the market is far bigger. I'm thinking of software like Things or Fantastical. High quality, polished, reasonably priced with an enthusiastic user base.
I have been in plenty of countries where there isn't any Mac to be found.
Supporting developers were they are is likely to be much more successful than supporting developers were they wanted them to go.
Personally I got burnt out on it a long time ago and won't be migrating to this or any other new MS UI technology.