Steve Wozniak wanted - and built - a pre-assembled computer for tinkerers and engineers; it also turned out to have some mass market appeal as a game and spreadsheet machine, and Apple made a fair amount of money selling it to hobbyists, gamers, schools, and businesses.

Steve Jobs realized that computing appliances (from computers that you couldn't open up to handheld music/game/app/phone devices) for people who typically had little or no interest in tinkering or engineering ("the rest of us") was a much larger market. Apple claimed the high margin section of that market and became one of the wealthiest companies on the planet.

I recall a story about Jobs being opposed to hardware - and software! - upgrades for the original Mac because "you don't upgrade your toaster." That's precisely the thinking behind the iPod, iPhone, iPad, and Apple watch - except Apple now knows that you'll have to buy a new internet-connected toaster every few years if they stop producing security bug fixes for your old one.