> Batteries have been used as part of planned obsol[esc]ence for too long and a whole small business industry of replacing phone batteries has appeared because of it.

Note that early phones had replaceable batteries and it was later phones that dropped that feature. The idea wasn't that making the phone impossible to open would compel people to replace their phone faster; it was that given that people didn't keep their phones long enough to wear out the battery, there was no need to make the battery accessible.