I'm ex-Apple and an Apple fan as much as anyone, but I also have the benefit of being old. Not to take anything away from Apple's collective accomplishments, in many of these categories I'd say they "redefined" more than "defined".

There were many smartphones before the iPhone (the Palm Treos were great), many MP3 players before the iPod, many tablets before the iPad (the Microsoft Tablet PC came out about a decade before the first iPad), all-in-one PCs go back 40 years now, etc.