She uses it both for gaming and studio recordings with Ardour.

How is the gaming experience on Debian nowadays? Last time I tried it (several years ago now), it was kind of a nightmare jumping through all of the various hoops required to get it to pay nicely with an Nvidia GPU.

No it isn’t. This is an unsubstantiated rumor and watching 18 minutes of sensationalized AI slop isn’t going to make it true or teach you anything you couldn’t learn from a 10 second Internet search.