It's a built-in and supported workaround, just intentionally hidden (because Microsoft wants the average Joe / the masses to use an online account). That's not something that a random person came up with, even if it's not advertised.

Straightforward would be a big button saying „skip this step“.

IMO, that's the difference between straightforward and obvious. It's not obvious because Microsoft doesn't want it to be obvious. But one can totally tell a family member "press these keys, then type this command and press Enter" - non-technically inclined people couldn't care less about further explanation, only about the end goal. I've done more complicated troubleshooting over the phone...