> And this way we don't need to compromise the shell of the phone with seams and things that can fail
The ancients managed to design around replaceable batteries, I don't think these techniques have been entirely lost to time.
They also designed with cheap shells that felt loose before a year was out, and offered exactly zero water and dust protection so if your device got wet, it was considered out of warranty.
The ancients also designed ways to carry humans without gas or electricity, but I don't really want to regress to those techniques.