We've had thin smartphones with replaceable batteries 15 years ago. That was the standard. Galaxy S5 was the last one in that series, and it's not looking too different from today. It was even IP rated for water!
Batteries also don't really die, but you get shorter and shorter life. When a device that barely could make it through 2 days of use now survives for less than one, an "upgrade" seems nicer than it really would've been if you could just swap the battery.
Batteries also don't really die, but you get shorter and shorter life. When a device that barely could make it through 2 days of use now survives for less than one, an "upgrade" seems nicer than it really would've been if you could just swap the battery.