This suggests to me that the simpler recording setups of Decca (Wilkinson), Mercury (Fines) and RCA (Layton) engineers is a significant factor -- as you suggest, nowadays too many microphones. So a question for a thread might be: How does the sound or listening experience differ before and after the adoption of multi-miked, multi-tracked recordings.
Then again, when you start taking things apart there seems to be some inevitable loss putting them back together.
Agree, this is the more pertinent listening-experiences question. The 1950s Decca, Mercury, RCA recordings had more noise but far greater natural ambience and better captured hall acoustics. In studio recorded music, Sinatra's albums sounded distinctly more natural, say, 1966 and earlier, than later. The 1963 recording of Muddy Waters' "Folksinger" is a sonic revelation of audio holography with even modest systems, whereas 1967 "Sgt. Pepper" is obviously a flattened and fake-spaces sonic concoction, and it only got worse as the Beatles recorded more of their tracks in isolation from each other. There are myriad examples.
There are several factors that undermined natural sound as had been attained by the mid-1950s, within a few short years:
1/ Rapid replacement of vacuum tube recording consoles with early solid state.
2/ More use of smaller diaphragm dynamic mics, electrets and similar.
3/ Increasing reliance on multi-tracking and excessive multi-mic'ing...
4/ ...Which led to more and more not having the band in the same room at time of recording.
Some popular musicians limited these trends, Tom Waits and Bob Dylan notably among them, and you can hear the differences. Overall, we got more "factory music" from the technology bloom in music recording, but there was an overall loss of relaxed naturalism, tonal truth and spatial immersion.
There are certainly modern, boutique labels that can give you a lower-noise version of the vintage experience, notably M+A Recordings here in Los Angeles, but only a relative few will be familiar with their repertoire. Whether on vinyl or CD, the recordings are vivid and holistically spectacular. You can find good modern examples if you're open to alternative music.
Listen to Miles Davis recordings before 1966 and after. Chet Baker in the '60s vs the '80s before he died. Beatles before '67 and after. To me, given the evolved state of modern digital, this is a far more demarcating contrast to consider. There are modern labels and artists that emulate the older simple mic'ing, low tracks, everyone in the room, but they aren't what most people are listening to most of the time.
Phil