[Sanddancer]

There's a huge difference in functionality and philosophy between powershell and posix. For one, everything in powershell is an object. What this means, is that when you pipe things together, you're not just piping output strings, you have iterators, arrays, closures, typed values, etc at your disposal. Additionally, in powershell, you can use arbitrary CLR libraries as if they were native. Posix shells, in contrast, tend to require you to write and build wrapper libraries to import the functions into your scripting environment.

So in short, using a posix shell would mean getting rid of all of the work MS has put into an insanely flexible command environment over the past several years. Insisting on posix just denies the flexibility to experiment and develop something which serves a different problem set, or approaches a problem from a new angle.