I would say that Steve Jobs didn't think about products. He thought about categories or industries. With the iPod, Apple didn't try to make a better MP3 device, they tried to make a better music industry. With the iPhone, Apple didn't try to make a better phone, they tried to create a pocket sized computer. With the iPad, Apple didn't try to make a better netbook, nor even a better tablet. Apple tried to create a category of portable computers.
The reason Apple reinvents every market it enters is because it doesn't try to improve on what exists. It tries to create what they think should exist.