And a virtual world can be every bit as varied. You see someone sitting at a computer playing the same video game all the time. They see farming, running dungeo

And a virtual world can be every bit as varied. You see someone sitting at a computer playing the same video game all the time. They see farming, running dungeons with guild mates, forming relationships, crafting things, fighting wars and so on. Defining a metal illness is non trivial, but for starters, their mental state needs to cause them or someone else harm or discomfort. But it's also possible that the discomfort isn't caused by their mental state, but the society they are in who rejects them. In 1000 years no one will remember what that person in their virtual world did any more than you know what a random person 1000 years ago did, but if they feel every bit as accomplished and emotionally fulfilled, then what's the difference? Now if their involvement in their virtual world means they are unable to sustain themselves in the physical world (not showing up to work, health problems, etc) then we have a problem that needs addressing. But living in a virtual world, in and of itself, is perfectly valid.