You're full of it. It has nothing to do with brand consumption. The truth is that the tradeoff for cheap, reliable, waterproof and sort of shock resistant is to make things with glue and not with screws.
Maybe for the watch, but not for the phone. There's nothing glued in the iPhone other than the battery. The case has snap tabs and screws holding it together, and all the complex parts are fastened in place using screws. There's absolutely no good reason for the battery to be glued in there, either. They could just as easily:
- Use compressible foam to hold it in place so that it doesn't rattle. Manufacturers have been doing that in battery compartments for most of a century.
- Bond it to a thin, stiff plastic layer and fasten that in with screws from the top so that it hangs suspended by glue in the middle of the battery compartment area.
- Bond it to a thin, stiff plastic layer that slides into a tiny track from one end. Bond the plastic layer to the bottom or top part of the case, allowing you to slide it out the bottom without even removing the back. Connect it with a couple of small spring contacts on the end of the battery.
- Glue it to the back part of the case (or a portion thereof), and offer that entire piece as a replacement part.
It's the height of laziness to say, "We can't make it this small without holding everything together with glue." It isn't that they can't make them easy to repair, nor is it that it would make them much more expensive or bigger or anything else. The reality is that Apple doesn't want their products to be easy to repair.
I'll illustrate why this is the case with a story. My parents recently took their iPhone 5s to Apple for repairs because its battery life had turned to crap. Apple looked at the device and said that they couldn't repair it because the battery was bulged, and it would be dangerous to remove it (because it is glued in). They wanted... either two or three hundred dollars to replace what was approximately a $30 battery.
Why would Apple want to make it easy to replace that $30 battery when they can glue the battery in place and use that as an excuse to cheat their customers out of hundreds of dollars, then take the defective hardware, ship it somewhere, rip the battery out in spite of the safety concerns, glue a new one in, and make even more money selling that refurbished phone to some other poor sucker whose battery dared to swell up? No, the irreparability of these devices means big money for Apple and they know it. IMO, these laws can't come soon enough and don't go far enough.
It should be illegal to glue a battery into any device, period, full stop.