It's very amusing to see Sinofsky of all people all but dumping on .NET and (still?!) not understanding why developers so proactively jumped ship from Win32 & MFC hell to WinForms. Or why the HTML/JS app model in Win8 never really took off.

I was in DevDiv during his great WinRT push and the overall feeling I remember was that the guys in Windows had zero clue as to what the devs actually wanted, but were hell bent on scorching all the ground that wasn't theirs. My team actually did some prototyping for Python/WinRT support, and we had it working to the point of the visual WPF designer in Visual Studio even. Unlike JS, it was full fledged - you could use anything in WinRT same as C#, extend classes etc, while JS limited you to a "consumer" surface of the API. That prototype was killed because Windows (i.e. at the time = Sinofsky) said they didn't think developers cared about anything but JS so they didn't need another high level language.

It was also when Windows was aggressively pushing their Metro styling on everything in the company, sometimes to ridiculous lengths - e.g. Visual Studio at the time "aligned" with Metro by, I kid you not, making the main menu bar ALL UPPER CASE so that it looked like Metro tabs! You can still see the blog posts announcing this "feature" when it shipped in the first public beta of VS 2012, and the comments on them.

And then there was Windows RT (not to be confused with WinRT, because Microsoft product naming!). Aka the Windows-on-ARM that ditched decades of backwards compatibility because Sinofsky decided that rebooting the ecosystem is the only way to compete with iPad or whatever. What actually happened was that the users went WTF because none of their native apps - which, contrary to his take, were very much alive and kicking! - worked there, and devs went WTF because they were told that they'd need to rewrite everything yet again in some new thing that was kinda sorta but not quite like WPF, because Windows just hated .NET that much and couldn't accept that the devs liked it over their stuff. So the app store was a barren waste, and without apps there would be no users.

Some of the technical details in there are plain wrong, too. For instance, .NET 3.0 actually shipped in Vista, contrary to his claim that it was shipped in Win7 (and that it was the first time .NET shipped in consumer Windows - in fact, that would be .NET 1.1 shipping in WinXP SP1).

How is he dunking on .net?

I think one of his main points is server .net was (and is) great.

But the UI part of it was cloudy.

I see it as complimentary to the post not contradicting it.

Often kind of person who makes such mistakes is the kind of person unable to learn from them. The post by Sinofsky is exactly as I imagined it would be.