Earlier quoted context omitted.
I doubt they want POSIX ever again. They want 'me too' POSIX-enough Developer workloads right up to the Deploy phase, where they have are building cushy, hard-to-evade on-ramp to Azure.
Your argument is confusing... Can I deploy my Django app on Azure? If the answer is yes, what exactly, is "me too" about that?
How about Libraries, Compiler or Runtime?
'Me too' is in MSFT providing a "Super Runtime" in the form of WSL.
If your app doesn't require Microsoft's kernel or user space functions, why should your team?