On MacOS that would be an amazing poor UX, cmd+tab works on Applications, not specific windows.

Switching windows within the same Application is cmd+` ; and only works on the current workspace.

What about using AltTab?

https://github.com/lwouis/alt-tab-macos

I agree it would be a poor experience, but macOS does have an additional shortcut key for switching between windows: Command–Grave accent (`)

did…

did I not mention that?

I was severely jetlagged when I replied. Apologies for restating things. The suggestion seemed to me to be limited to browser windows

You absolutely did, but are you not aware that cmd+` allows you to switch between windows?

only with the same application, and on the same virtual desktop (which is what i said).

i am confused here now, what do you mean that i am missing?

What you are thinking about is provided by a third-party app (AltTab). It was never a part of the system.