I actually prefer macOS's PiP handling compared to other operating systems. In that it's a blessed concept that only goes to one corner of the screen and can be shunted out of the way easily.
Now imagine if that was designed properly, and you could just do that to any window, regardless of what the program thinks it should look like.
Now imagine if that was designed properly, and you could just do that to any window, regardless of what the program thinks it should look like.