mdeneen:There is a fundamental underlying reality that engineers in the "LP era" didn't use as many "deadly" means as engineers do today in the CD era. By which I mean compression and all the rest that we now understand make the modern CD.
I really think that the "deadliest" thing that happened was the use of 8, 16, 24, track tape. Heck, you could slave as many tape machines together as you needed for as many retakes as you wanted. And you could do "flying switches" between several takes to assemble one "good" track. Multitrack production exploded because of the "perfection" that was attainable. This occured before CDs came on the scene and got worse after digital recorders were made for studio use. 48 and 96 track became common, and of course, they could also be slaved. The talent realized that no matter how "off" the performance was "it can be fixed in the mix". So subconsciously, perhaps, the performers stopped trying to nail a good performance in the studio.
Then came the boxes. There is now a box out there to fix any problem. Vocalist singing flat? Put er through a pitch shifter, voila!, magically in tune. Kinda dry from close micing? Digital reverb to the rescue. Timing off? Line it up in ProTools. Etc, etc.
Looks like a skill issue. Or several simultaneous skill issues. Performance skills, recording skills, mixing skills, mastering skills. And the chain always breaks at the weakest link.