Then the law should just make sure that there's a second source at least for the batteries, that technicians have free access to disassembly instructions, and that it can be done without undue effort or risk.

Requiring common tools or technical skills for replacing something that last 4 years is not a hassle to justify enshitiffying phones design as long as you're not vendor locked for such replacement, and a technician can do it in a reasonable amount of time, with reasonable tool and without the risk of degrading the functionality of the device doing so.

I'm old enough to remember the old Nokia phones that had removable cases, removable batteries, and you would have upgrade envy for the last year of your 36 month cell service contract. Then we had wince and early android devices and BlackBerries which were pretty much the same.

Somehow we made it work back then.