While I'm all for reducing the social stigma of gaming as a hobby (why is it viewed so differently to watching TV all evening or scrolling through your social media app of choice), I would be very interested to see a study like this that compares the mental health effects of various genres.
There are some genres out there which have a reputation for their toxic communities (Looking at you, MOBAs) - and it would be fascinating to see if these genres have different effects on mental state or health to city builders.