"Every part of the signal chain—from earbuds to digital/audio converters—is improving and getting cheaper." Like other technologies, digital audio had rapid improvements in the first 10 years but has mostly leveled off as we have reached the limits of physics, signals and sampling. Good audio equipment is still expensive and power hungry in every part of the chain.
Technology won't save what are fundamentally psychological issues. We respond emotionally to louder signals. We like songs that sound similar but not identical to things we've heard before. We listen to things that our friends like. All of this points to why top 40 songs sound the same, but "all records" is pretty broad. There has never been a better time to create something new in music, and yet we lean heavily on what has worked before -- in songwriting, in arrangement, in production -- so that others will like and identify with the creative output.