[p4wnc6]

In grad school I always heard Scott Aaronson harp on these issues too. He was fond of saying that quantum algorithms organize things so that amplitude here and amplitude there is arranged just so, to ensure that wrong answers experience cancelling amplitudes, rendering them highly unlikely to be the observed outcomes.

It's not about "trying everything in parallel" but rather shoving amplitude around to ensure that correct answers are overwhelmingly more likely to be observed.