Lol, compare modern music with trash we had in 80s, 90s. Even nowadays' pop trash sounds significantly better than old hits made on synthesizers. Everything evolves, as I said. Maybe you just forgot low-quality movies of previous years, but they did exist, tones of them.

We only want to remember good things.

There were no meaning to mass produce and diffuse music in those decades like there are today. I'm not saying 80s and 90s music was perfect (why pick those decades?), i say the more the demand the more the money the more the highs and the lows.

The "quality" you're referring to, i don't know: you're talking about what features of a sound...fidelity, loudness, dynamic?

Anyway, truly the 80s were the years of trash music...but trash as in metal though.

Loudness, of course, man. What else is the measure of quality? Loudness, without any doubts. Of course I talk about loudness.