I've lost count of the times I've enjoyed a live performance, bought a CD at the gig and found on listening to it that what attracted me to the artist's music is diluted or obscured by excessive/inappropriate production in the studio. Having spoken to any number of working performers about this over the years, it seems that often they get pressured into it by the management or production people; or sometimes they just get carried away by the fun you can have in a studio! (I know that one myself...)
Mind you, sometimes the reverse happens... I've always loved James Taylor's music, and last year got to see him in concert for the first time. He walked out on stage on his own and sang with just his own beautiful guitar for accompaniment. Magic. Okay, so he did have some sidemen who joined him after a few numbers, but he'd proved (if proof were needed) that he could cut it on his own.