But if I am going to learn something new, what advantages this powershell has that python does not? Cygwin + bash is cross platform enough for me to switch between ssh windows in linux boxes and my windows desktop.
Desired State Configuration (DSC) that FTFA was about, is definitely one such thing that PowerShell has that python has not. DSC is a *declarative* description of the configuration you want for a target system. You should think more in line of Chef or Puppet than Python. PowerShell DSC for Linux actually *uses* Python.
The idea is that you use PowerShell to define a data structure (much like a Ruby hash) that describes the configuration of the node. DSC will itself resolve dependencies. If you require a feature DSC will ensure that the feature is installed - much like a package manager - but it actually interacts with the package manager. What package managers do not do is to configure the products once they are installed. This could be connection strings, IP addresses, user accounts.
PowerShell DSC for Linux has "resources" for file system, user accounts, text file content, package managers (Yum, Apt, Zypper), scripts, daemons, ssh keys and more. You use those resources to describe how you want a system to look - like a Chef recipe. The resource description can be parameterized (it is just a PowerShell function and can take parameters like PS functions) so that the same resource description can be used for multiple targets with slightly different values.
Once applied, DSC will ensure that the target is set up so that it matches the target. From there on it can also report on drift (e.g. more users created, files deleted/changed etc) and can warn about it and automatically bring the node back to the desired state (undoing the drift).