And several were overpriced flops that ended up at a landfill in-box. I think "quantum leap" is the same perennial silliness people have been calling out since the coining of the Reality Distortion Field. Half this site would have you believe Bob Iger took a quantum leap in entertainment, it's praise that devalues the meaning of progress.
I'd go further as to say that today's modern struggle for privacy and software freedom only happened because of Jobs' ambivalence towards the developer community and fearmongering over parental controls and other meaningless nonsense.
Apple II: Very similar to contemporary products. Interesting improvements added by Wozniak.
Lisa: Stolen from Xerox (and made worse). Jobs' contribution: cosmetics, mostly.
Mac: Oops, the Lisa was too good.
Next: A somewhat better Xerox ripoff with a mix-in of other common stuff.
Newton: OK, somewhat innovative.
iPod: Stolen from a whole bunch of people
iPhone: Nothing but a PDA with a phone integrated in it. Obvious next step.
As for "developing to perfection", well, if a smooth, candy-colored shell around a deliberately limited device is perfection, then yeah. I guess you can credit Jobs with a willingness to break from standards, but not with unusually good judgement about when to do it.
• Steve Jobs's bad judgment led to the Apple II, Mac, iPod, and iPhone.
• John Sculley's good judgment led to the Apple Newton.
That assessment seems like a refusal to be impressed by the public idolatry of Steve Jobs. Yet even if he wasn't some superhuman philosopher king, nor even supremely technical, he still had talent, and did help bring some seminal tech products into the world.
It's an "innovation" coin, not a "judgement" coin or a "profitability" coin.
For some reason, people get the idea that innovation comes from executive management. It doesn't. Popularization may. Commercial success may. Innovation generally doesn't.
Jobs had talent for (a) packaging up existing stuff, but not in shockingly innovative ways, (b) recognizing and refusing to accept garbage products, and (c) selling the stuff. That's all execution, not innovation.
He had a genius for dreaming up products the world didn't know it needed yet, and for developing those products to perfection.
Several of those products were quantum leaps that the world would not have figured out for several years, if ever, without Jobs.