The practical purpose of asking is to get a feel for how many people use it.
Less tongue in cheek though, it sounds like you have the same questions as OP. If you're curious what might be the practical purpose, why not ask people who use it why they do instead of berating OP for asking if anyone uses it?
As someone who used bash on Windows through MSYS, I don't see the issue. It was different, not inferior, to cmd and PowerShell. If someone wants to use PowerShell on Linux why be such a condescending jerk about it? Sometimes people just wanna try things for the fun of trying new things.