They charge super fast. You can get 1 hour of playback from 5 minutes of charging. You can also charge one at a time if you really need them continuously.
Gaming with BT headsets is a poor idea for so many reasons in general, so I have no idea why it was even considered.
If you are having prolonged gaming sessions, you are doing it at home, so use wired. If you are on the go and want to listen to music or watch videos, use wireless. If you want to have a short gaming session on your laptop in public, then yeah, sure, airpods will serve it just fine. Though in those 6 hours, you might want to take a 15min break or two. And in those 15 mins, it will charge for about an hour of battery charge on airpods.
It's like complaining that a Lambo is not good for carrying lots of cargo. Technically the truth, but that's not the use case at all.
when you get the 10% warning you pop the left ear out and charge it until the right ear dies. Then you put the left ear in and charge the right ear. 20 minutes later you put them both in again. Easy peasy.
If you're playing games or something that takes heavy focus, you want to stay ahead of charging, not wait for something to die l.