Games train a level of mental flexibility, but overall they just teach the player to be passive, reactive, and submissive. The game gives you a task and says "make it happen", and whether it's linear or open world, the logic of the world and the nature of the task itself has been laid out by the creator. The player's mind just confabulates a way to make sense of obeying all orders. This "teleological" mode of thought is apparently not transferable, ie it doesn't scale. You can't leave the game world and apply the same reasoning skills to "The World" or "God the Creator", because the world is rarely clearly telling you what to do or narrowing the search space, nor is it defining metrics for the overarching goals required for long term thinking. The brain cannot construct a "path" from A to B if it's conditioned to get all of that from an external source.

One cognitive defect that comes from gaming I would just dub "persistence". In a game you know where you're supposed to be, supposed to go, and you know it's supposed to be possible. So you will persist in the face of anything, assuming there must be a way. When really at every stage of the endeavor you could have reflected and altered course. A lot of people end up essentially lobotomized, they go dormant until something tells them what to do. The World will do this as well, and the physical body itself, but not in the same manner. It also tells you what must or is supposed to happen, so you will lock into certain scripts.

Video games are a way to manufacture passive order follower slaves. The old games back in the day were less terrible about this, but the gist still applies. The other interesting thing is, a lot of people are apparently incapable of recognizing "architectural slavery". So long as there is nothing overt and visible (identifiable to the mind and senses) standing there telling them what to do, an environment or game world logic constraining and guiding their behavior and thinking goes by completely unnoticed. It tells you what is good and bad, tells you success and failure, tells you the right and wrong ways to do something, and if it has bugs or implementation shortcomings, it tells you that you are smart and mature for recognizing it and conforming to still get it done. They submit to the mind of the game's creator believing they are creating their own thoughts. You could say this applies to sensory reality itself.