The historical Hitler was pretty smart, and most of the current historians on World War II I have read take the view that the surviving generals used him as a scapegoat for what went wrong. Of course starting the wars in the first place was what went wrong, but the late twentieth century views on his being inept in conducting it are at least greatly exaggerated.
What you really means is "hands off Hitler" and that is worth discussing.
Consider Hitler as a sort of fascist constitutional monarch, or more believably posit that he was sort of a guru to the Nazi movement, and war really interested in German domestic politics and foreign policy, with the same ideas, but had no interest or aptitude in military matters. But he had the same philosophy as IOTL, so the wars still start. That is pretty believable and wouldn't require a personality transplant. Lets say that his reaction to his experiences in World War II is that he just doesn't want to deal with the military and delegates everything.
But even that has problems. Who does he delegate it too? The upper echelons of the army were fired in 1937-8 on various pretexts and replaced by generals much less willing to question Hitler's orders. So this POD implies that at least Blomberg and Frisch are still there, though Beck probably still resigns for the reasons he did IOTL. Maybe Blomberg and Frisch go anyway because of power struggles that our laid back Hitler doesn't step and stop. But then who is in control?
But you might be positing that Hitler is still hands on and involved, and just makes better decisions. If that is what you really want to discuss I will stay away from the thread, since I have nothing really substantial to add to that.