I care. This thing’s already thick and heavy enough, and I don’t particularly care about popping the back off my phone to replace a battery. It’s like…once every two years that I have to replace it.

Apple’s sales fall and people don’t buy new phones because “it looks just like last year’s phone.”

You also start running into usability issues. There's only so thin a phone can be before it's less of a phone, and more of a blade that'll bend if you sneeze at it wrong.