Also, I suspect the benefits of gaming align with higher-order human needs (e.g. From Maslow's hierarchy; problem-solving, confidence, achievement etc).
Obviously, sitting there doing nothing for long periods of time probably isn't great but I think it's good to just set aside moments where you stop trying to distract yourself. This can be done through meditation or some other method of your choosing (outdoor activity is good). It's good to let your thoughts come in and sort of train yourself to stop fearing them or having such knee-jerk reactions.
It seems like I've developed a healthier response to them by doing this. I can laugh at a lot of my stupid negative thoughts more easily now.
Now I play them in autopilot mode. Just enough engagement to ward the brain demons.
It's not so much an enjoyment as it is a reprieve from myself. I still enjoy them to an extent, but not as much as I used to.
But if most of your discretionary time is spent doing unimportant things, that can contribute to depression and anxiety.
"Dial tone mode" sounds a lot like the checking out alcoholics, drug users and other people suffering from compulsive disorders waste their lives doing.