I never wait around while the car is charging (generally only charge at home), but this has been useful for waiting to board a ferry, actually being in the car on a ferry, and waiting for road closures to clear.
I also do have a steam deck, and this is basically the same thing but with a bigger screen.
There are people reverse engineering the glasses right now (I have a pair):
https://github.com/wheaney/XRLinuxDriver
One of my longshot projects is to convert my framework laptop main board to exactly this. I basically use the glasses a lot more than the screen at this point (it’s more convenient at night before bed)