I do not see where and how it works honestly, I just always thought that laptops are not for gaming for sure. But I have seen some laptops with something like 1050ti or 1060 for real, no joking here. But does it comfortable to play on laptop ? I doubt really.
If I am PC gamer why would I dream to plug my graphic card in that thing for example if I already have very powerfull PC anyway. I can consider such opportunity for example if I do have some very powerfull laptop and want to game even faster.