I think OP believes that 11 is more significant ;) https://en.wikipedia.org/wiki/Up_to_eleven

It implies that they're not all at 11 yet.

Sure, but anyone can go up to 10. These go to 11.

Latest stable macOS release is in the 11.x range. But it's likely that macOS 12 will be released before Windows 11, so GP's magical moment might not come to be.

Not really, because by the time that windows 11 is released (in the fall of this year), android would have moved on to 12.