sorry but this doesn't work for me. I get that when creating an album you should think about the playback gears that will be used. just like for pictures and video, it's not a bad idea to have a few crappy monitors or at least crappy color profiles to test if the result still works. but that's as far as I can follow you. chronologically, we started with very limited SNR and dynamic available for playback. a MP3 is arguably as good or better than an old K7 tape in that respect depending on what you're looking at. and it's a 'go to' example of low resolution. my DAP measures better than my dad's expensive stereo from when I was a kid. so I just can't follow that rational of making low dynamic music to adapt to the bad gears. to me transducers and ambient noises are the most limiting factors of playback, not file resolution or DAC chips. your narrative just doesn't align with what I know of objective measurements. I'd rather go with the idea that our daily life is noisier than in 1980 itself noisier than in 1950. that could probably be one of the great many reasons why we make music with lower dynamic nowadays. I don't have a clue, but at least the correlation seems to work. which is a start.