As the article says (“After standby or restart, the monitors get swapped by the OS, so moving the cursor to the left monitor will actually appear on the right monitor, and vice-versa.”) you might have told your computer that one of them shows the left half of your desktop and the other the tight half.

Now, when your system wakes up from sleep, how does it know which one is which? The workaround is to use the port they’re attached to, but that isn’t always might even both be attached to the same port.

It might from your perspective. If you work in an office where everything looks the same except for the numbers above the doors that would be the situation.

I'm not being facetious, that's the monitor issue precisely (while also being completely not).

Because unlike rooms and doors, you can switch what port a monitor is connected to.

It does if you give directions to the lounge by saying go through door marked XYZ.