PowerShell isn't the only option available for Windows. You can install Cygwin or other alternatives and have your bash and linux-y environment on Windows.
True. But if you spend most of your time in and around cygwin, it makes sense to switch to some kind of Unix -- while cygwin is marvelous, the nearly perfect Posix layer comes with a non-trivial performance cost - e.g., fork() is horribly slow in cygwin, as are many forms of I/O.