MS has never been a software platform company. That's the fundamental reason behind the issue the article talks about.

MS has always been a software application company. Windows was never anything more than a way to sell MS applications--and Windows 3.0 and later wouldn't even have existed in the first place if IBM hadn't dawdled so long over OS/2. Even in the MS-DOS days, when MS was reaping the benefits of IBM's previous bonehead decision to hand the PC OS market to them, MS was selling Office applications--on the Macintosh.

The basic Windows API, in all of its many incarnations, has always been a second-class citizen; MS Office applications have always done their own things that other Windows applications couldn't do without using undocumented features that MS could change at any time (and often did). One could argue that the only reason MS even allowed third-party Windows developers to exist was so that they would, in the words of one of PG's essays, do market research for MS. When a third-party dev came up with something that got enough traction, MS would simply incorporate it into their apps.

This makes sense, because even in the best times Windows was not the biggest money maker for Microsoft, it was Office. So MS was never fully behind Windows, it was only the means to an end, which was selling the most software for enterprises.