A big telly is, to borrow a phrase from those higher up the economic pyramid, "an investment." Not in money terms, because televisions lose value fast, but as you said entertainment and education. Once you've bought that TV it's yours until it breaks and you can use it regardless of weather, illness, or whether you're a bit short that week. A nice television has somehow become the go-to for "poor people spending frivolously" when it's actually delivering a lot for the price.
It's also responsible for a huge amount of cultural capital and can act as a jumping off point for self directed learning -
Sesame Street, including the Alphabet Song (with an X Y Zee) = learning that Americans pronounced some letters differently, that there were different spellings that sounded similar. And that anything American = parent was going to hate.
General pronunciation of English, French and Italian.
See a film on a Saturday afternoon = I'll read the book that's lurking in the shelves. Learning that a lot of things on TV were originally books (and could be better).
Film tropes.
First introduction to the Ship of Theseus Paradox.
Greek mythology. Ulysee-ee-ee-ee-ees. The Iliad and Homer's Odyssey. Whether through the medium of rabbits or with the chills of the Hydra's teeth soldiers (and therefore giving an idea of how to pronounce the names when read in a book I was bought after being transfixed by Harryhausen movies - because there wasn't anybody in the house who had a Scooby how to make sense of Ancient Greek).
Alexandre Dumas. One for all and all for one, Muskehounds are always ready...
Religion. For good, for bad, for indifference.
All of those 30s, 40s and 50s movies.
Programmes about Art and painting, even the design and lighting in programmes and films evoking eras and aesthetics.
Sarcasm. My first true language. Hyperbole, scathing comments, irony, infamy (infamy, they've all got it in fer me).
HG Wells, Jules Verne, Philip K Dick, Agatha Christie, Shakespeare.
It's how I knew about different countries, that other people's homes looked different, that other people had different lives that included jobs and education, music was more varied than anything heard indoors, that people spoke differently.
TV is the way I became able to pass for a vaguely functional human being. Because there wasn't any way I was going to be anything but a repeat of the previous generations without it there to give me a glimpse of something else, something more.