piggy-backing -- is there a use case for hotplugging of GPUs?
I have a macbook air with an egpu connected by a thunderbolt 3 port. I unplug the gpu when I want to take the laptop somewhere, and plug in back in when I'm at my desk.
Yes, Windows uses it for suspending discrete GPUs on laptops to save on power, for designs like surface book, for external GPUs and some more server scenarios.