Re: "...customers see the need to migrate"
"Have you ever used just the command line in Windows Server??
I have, as an experiment, and it's not good at all."
You have to use it all the time these days via Powershell - sort of like the best hybrid Unix shells like PASH - but much more advanced and powerful.
" I love Windows but I'd never gloat about its CLI. Come back when you've tried to perform anything beyond basic file operations."
Because you have no idea what you are talking about. You can do pretty much anything you can do via the GUI - and more - via the command line / Powershell. In fact most of the GUI tools are just wrappers for Powershell scripts!