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I think the poster is confusing/conflating dynamic range compression with file compression

Even limiting the scope to MP3 at the same bitrates modern encoders are much better than what we had back in the 90s.

Obviously you've never listened to SiriusXM.

But seriously, the poster is probably complaining about how most modern music is heavily compressed in dynamic range, so that it sounds better on crappy earbud headphones and smartphone speakers.