Big mistakes are one thing... but little musical imperfections express the human quality which make songs sound so sweet to us. When you leave in some of those things that are a little off, music can sometimes get thick and fat... and that's a good thing.
When today's producers and engineers digitally align every stinkin' thing to pristine perfection, you lose that sonic attractiveness we tend to subconsciously gravitate toward. Yes, there is a drawback to everything sounding
too good -- you wind up sounding like everybody else who using the same tricks and the music develops a mechanical quality, like a Bruno Mars record.
When we look back at in 50-60 years, making everything "perfect" with digital editing is going to be seen as one of the missteps of the 2000s and 2010s music. Everyone's music sounds the same and as a result, it's got that cotton candy quality = it quickly dissolves and is seldom remembered.
YMMV... but I know I'm right.