Docker people will spend more time fixing and making bugs due to Microsoft, the documentation will become a mess (it cant possibly be same documentation for that different systems), the Linux-side of docker will be more mediocre compared to what it could have been if all effort went to it.
Remember Internet Explorer 6, Visual Basic, the horror that is Excel and the whole Office suite, Asp.net, Windows Millenium, The attempt to kill Linux by Microsoft through SCO.
The announcement clearly states that Microsoft are becoming "Docker people" -> they're contributing the code in the Docker ecosystem, which means precisely that our problems become their problems.
This isn't any different than Red Hat contributing the Device Mapper backend to Docker so it can run unmodified on RHEL. Nothing about the UX changed/fragmented from there.
Docker people will spend more time fixing and making bugs due to Microsoft, the documentation will become a mess (it cant possibly be same documentation for that different systems), the Linux-side of docker will be more mediocre compared to what it could have been if all effort went to it.
Remember Internet Explorer 6, Visual Basic, the horror that is Excel and the whole Office suite, Asp.net, Windows Millenium, The attempt to kill Linux by Microsoft through SCO.