Think you hit the nail on the head with the dopamine hit thing. Online media today is essentially built around that and rewards it. Look at Youtube shorts or tiktok. I can spend hours just scrolling through youtube shorts because it’s quick and random dopamine hits. no long content, something different on each scroll, move on to the next. even sites like this contribute to it. each post is something different and also a quick vomit of information.
dedicate oneself to hours of the same consistent media like a tv show or movie or even a videogame I can see as being difficult for people who are now conditioned to quick 10sec hits of info.