I think I heard long ago that, in his dotage, Henry Ford was quoted as saying "The only thing wrong with the Model T was they quit making them!"Truth be told too, if you dig into his personal history Henry Ford was...not a great person...and he held some views that even then were not exactly mainstream or considered favorably(particularly his open and rampant anti-semitism).
The Model T was a wonder of both efficiency of manufacture and also of combining several known but previously unconnected concepts to make that happen.
He was also rather stubborn and it's almost kind of a wonder that the Model A ever made it to market. Chances are Ford would be an important footnote in history if the Model A and the models that followed had never been produced.
It's been speculated that his micromanaging created the horribly stressful situation that led to son Edsel's illness and subsequent premature death.