The difference here is that the NIT isn't a standard. It's a platform. (and you left Kerberos out of the important standards that MS sought to trash through embrace&extend)

It's more comparable to the presence of MS applications and frameworks on a Mac. MS doesn't destabilize nor undermine the Mac by having apps on it. It just gives Mac users choices to have those apps supported on a Mac. That might be different if the platform where to come to DEPEND upon the MS frameworks and apps (and that was a problem for the Mac in the past, where they desperately needed MS to keep developing Office for the Mac), but as long as it's optional, and there are vigorously developed alternatives, it's not a problem.