I didn't read all the posts, but remember Jimmy was a studio player early on, and he has said he was expected to play perfect - or be shown the door. Maybe he just got a bit tired of perfection - I know I will take a track with a flub or two that has feel over a sterile impeccable track, any day. (Yngwie is a good one to cite, as others have on this forum thread - often he lacks feel. The guy is a damn, damn good guitarist, though).
When you improvise on guitar, as Jimmy does live, you take the bad with the good. Look at Hendrix at Woodstock - it's practically a train wreck, but Jimi pulled it off due to sheer will.
And Jimmy also slung his LP very low playing live, it looks cool, but it's not easy to play like that. Not to mention prowling the stage.