In the US the EPA gets to set the guidelines for mileage testing, which GM has to follow. We've already had a major case in penalties for not following the guidelines via VW and emissions.

It will likely boil down to "typical use" so in the event that someone wants to bring Apple to court over it and demonstrate the issue, it could solidify what's currently a little vague. Laws aren't required to get it perfect out of the gate.

> then it’s probably so old and obsolete by then that battery replacement would be a silly waste of time

obsolescence is a spectrum, if a swappable battery mandate gives a small % of devices a few extra years it would be worth it... I already give old devices to family members and kids on the "free is better than nothing" spectrum and a swappable battery would have extended the life at least a few of said devices, in my personal experience