[brudgers]

I think it would require rewriting a lot of existing 'nix code to achieve the level of OS integration that PowerShell provides for Windows, that's aside from the level of integration PowerShell has with many Windows applications [e.g. Office].

Microsoft has been integrating interprocess communication into Windows since DDE in version 2.0 almost 30 years ago. Then more than a decade of OLE. Then more than a decade of .NET. At this point it and the reflection it enables are baked into the toolchain and pretty much comes along for free on a project. *nix has many advantages but everybody rowing in the same direction is not among them.