They have no choice. The speakers in flat screen TVs are SO bad that the entire world got fed up.
I think you've forgotten how good the sound was in many CRT TVs. My 85yo Dad still has the 2nd colour TV we bought in 1982 (26"). He keeps it because it still works perfectly and it sounds like a hifi system- and it's only mono! I've given him a couple of flatscreens (42" and a 32") and although he likes the picture, one has a pair of floor standing speakers and an amplifier to give sound that is good enough to comprehend what mumbling actors say on TV these days.
Around 2000, we sold a Panasonic 29" stereo CRT TV called 'The One'. It had sound so good, I used to demonstrate it with a CD player fed into the line inputs. It was phenomenally good.
Here, I found it on youtube!
I don't think people are listening to any more music than we did. We had quality FM broadcasting in the 70s/80s and 90s. Lots of stations broadcasting CD content for free. Now FM is a wasteland of lossy, compressed garbage.
As for headphones, the quality headphones in the 1980s made for Walkmans were better than much of the garbage being sold now. I listen to my boys overpriced cans and they are putrid compared to even an ancient pair of Sony MDR-70s I bought in ~1983. Way more efficient, comfortable and better sounding. Sure, the high end modern expensive cans are considerably better, but not the mass-market stuff- it's trash and always will be.
It's handy to have actual physical references from the 1980s to compare old to new...:
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I use these old Sonys for the computer. They are so comfortable I often forget I have them on my head- lucky they have about an 8ft cord.