> It is quite absurd (but categorically true) that the quality of audio that folks were generally listening to in 2005 was better than what we are doing today.

This isn't really true in any applicable way though.

Firstly, most people in 2005 were ripping CDs onto their ipods at itunes' 128kbps default - you're still only getting 160kbps today if you're running the free ad-supported Spotify plan but more people are paying for full quality.

More importantly though, the biggest impact on sound quality is noise isolation. People listen to music on the street, in an office bullpen, or public transport: in 2005 your wired sennheissers would need to be overear to deal with that environment in any reasonable manner.The ANC in even the non-pro in-ear airpods is giving you a night-&-day improvement.