If the gamer is happy spending his time with his parents and games, it might well be that his principles are aligned around this social connection and activity. It is difficult for me to judge from a distance. Moreover, he might not have any particular principle for his life. I know plenty of folks like that.

You have also used another word - meaning. Is that a synonym for principle?

I am sure the gamer interacts with his parents. I couldn't find anything in the medical literature about excessive gaming either. It is quite possible that he may have regrets on his deathbed like most people. However optimizing your life for the thoughts you will have in your deathbed might not be a great tradeoff if it means doing work that makes you miserable for most of your life.