Apple Watch 'not designed for the long haul,' says iFixit

iFixit, which regularly does teardowns of high-profile gadgets, found that the Apple Watch, which launches on Friday, won't be upgradable, which means users who want to future-proof themselves and keep the same smartwatch will be out of luck.

Planned obsolescence -- the idea that a product will eventually be obsolete, forcing customers who want to keep using it to buy a new model -- has long been part of Apple's strategy. In iPhones, for example, Apple releases new updates each year. The company's operating system, which is also updated each year, only supports some of the later models.