Mine's pretty tight. I'd probably avoid using the headset with it plugged into the charger though... tripping over the cable could be enough to develop a loose fitting.
I guess if you're just using it seated, that's not a risk. But then if your seated and stationary, the plug falling out shouldn't be too much of a problem either!
I'll be using a battery pack for extended sessions but I need to get a USB to USB-C cable or a USB-C power bank.
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Just checking, but are you sure it's plugged in fully? Black part of plug is seated against edge of Quest on mine...kinda snaps in.
This. Mine goes in a bit lose and then clicks in place. Can play whilst plugged into a battery pack no problem.