That's true for iPhones before the 5 series. After that, it just goes completely bonkers. See my sibling comment to yours, and the two iFixit guides linked from there - as I mention there, I don't regard the idea of doing my own device repairs as especially trepidatory in general, but current Apple hardware is an extremely special case.

True, but we're still not talking about the batteries being soldered to the board, like with RAM or storage on newer computers.

A point, but as far as I know the next phone manufacturer to do that will be the first.

...he said, before checking the iFixit teardown for the used iPod Touch bought to serve as a stereo headend. It's not precisely a phone, but that's not much excuse.