

Well I’ll say cassette quality can never really be good becaise of the slow speed and narrow width. . But 1/4" tape is about the best analog quality you can get (feasibly cost wise) if you go 15 IPS and half track (1 way play, no flipping).
If you want good sound for cassettes you can’t beat a Nakamichi deck, best there are.
Question on this, how would you expect the millions of people that heat/cool their homes to get by? Or are you advocating for a return to caves ? Unless you’re saying shut those down to build nuclear/solar/wind, which also takes a lot of dirty manufacturing to build. It’s kind of a no-win with this many humans.