Young, thank you for the response (:
The problem with the “too much of anything is bad” theory is that it fails to acknowledge that some things become dangerous at much lower doses than others. For instance, too much water is bad for you — but too much water occurs at something like dozens of gallons of water in one sitting. Most people could benefit from drinking 2x or 3x the water they usually drink. On the other hand, alcohol can be useful in easing tension — but the amount at which alcohol ceases to be helpful and starts to be harmful is very, very low. If we 2x’d or 3x’d the amount of alcohol we drink on a daily basis, it would be tremendously bad for us.
In my experience, video games are far more similar to alcohol in this metaphor than they are to water.