You say that like it's a bad thing. Having access to all those things by writing a few descriptive words and a great help system (looking at you, linux commands) is awesome.

Because ms is positionning it (and indeed publishing it) as a rival to bash, zsh et al. You can use PS on Linux if you feel so inclined and take advantage of most of the day-to-day features. The .NET interfaces are nice but to me they're more a way for them not to add cmdlets for everything by going "its in .NET already".