While I agree that it may or may not be true, I'm curious as to what makes it hard for you to "buy it."

I had always thought that anything attention-grabbing was likely involving some dopamingeric systems. It wouldn't surprise me if anything that grabs attention over a sustained amount of time could potentially lead to homeostasis-seeking mechanisms in the involved cognitive systems.

I doubt that humans / mammals evolved in a context with something often grabbed and held focused attention for hours at a time in the same way that is now routine for us to experience with phones, TV, video games, etc.

Conversely, I've wondered if some of the e benefits that some people report with medication are related to giving those systems a bit of a break.

It could end up being entirely false, but I always thought it had at least seemed plausible.