I think even highly-engaging well-written high-production-value TV doesn't satiate all of your brain's achievement circuits. Being an Internet native, I was binge watching shows well before the term was invented, and before shows were fluffed out to compensate for bulk half-engaged viewing. When an episode ends I don't want to leave the universe - it's so easy to up-arrow, backspace to the episode number, tab, enter. But I always found there was kind of a limit whereby eventually I would have "had enough" and move on to something different to feel like I was actually achieving something - getting back to work, social interaction, physical chores, etc.

Whereas the plethora of web/apps can provide simulations for all those different circuits in your brain, as you move between them each satiating a different aspect of your personality. And then when you've got time to really "relax", you can still turn on TV in the background to be engaged in multiple low effort stimulations at once.