Judging by the last thread about Bartender, when people were discussing alternatives, some people did not even know that was how you can rearrange your menu icons. So I can see why it's worth mentioning.
Also worth mentioning that this behaviour is completely undiscoverable, just like most power user interactions on macOS.
'Simply Command + drag your menu bar items to rearrange them.'
... err yes, that's how MacOS works without add-ons