Back then the recommendation engine was your friends and you would talk about 'Life on Earth's or whatever else was the main presentation on TV the night before. Everyone was on the same page so you could not ruin life for box set types.
In that framework you had to pay attention and understand the nuances of the story. If you didn't then you would not be in on convo and you would miss out. So you learned stuff.
If you only had two hours of time in front of a screen you were focused on the programming and it may have been what your parents want to watch, e.g. current affairs or drama. There was definitely an aspect of education to it.
I did not get all the channels or the colours that my contemporaries from other regions did so there is a 50% gap in my TV education, so I don't pick up on references to a lot of stuff, yet that shared culture is a good thing, humanising. The stuff I miss out on, it is like not being on Facebook.
The stuff YouTube are doing is wonderful but I wonder if we need to be trained into this solitary rather than shared viewing. The sharing in conversation was important to me.