But are all cmd commands portable verbatim to powershell? With all the options / special characters? (I don't know the answer, but https://en.wikipedia.org/wiki/PowerShell#Comparison_of_cmdle... lists quite a few missing commands, including "talkkill" and "find")

With the amount of online posts that tell you "to achieve X, open command prompt and run ...", it would be a bad idea to break any of them that go beyond a simple command. (so for example any "FOR ..." lines)