We should do this sort of iterative thought experiment w.r.t. regulations all the time.
It's sort of like compiling a big package of code. Just keep trying to compile and fixing the errors that come up until it compiles.
Why/why not?
If they did this, there's a good chance phone theft creeps back to high levels, since thieves could just
1. wait until Apple releases new firmware that unlocks the bootloader
2. use that new firmwaare to wipe the memory that handles activation lock
3. re-install a fresh iOS
4. resell the phone
iPhone 8's still go for over $100 on eBay, so it's not unprofitable to 'inventory' stolen phones by throwing them in a desk drawer to sell within a few years.
Even back on the nexus line, if the phone was stuck in activation lock, you’d have to unlock with the google account and then with the phone unlocked you’d use adb to unlock the bootloader.
Given the number of smartphones currently sold world wide per year, and allowing for reasonable growth, if everyone discarded their phone every year and those discards were all just dumped into a 1 km x 1 km pit, if you made that pit 30 m deep it would be able to hold well over a century's worth of phones.
The moment we run out of rare minerals to build touch screens, there wont be an infinite e-waste problem anymore, unless we find some other fancy uses. It’s a finite resource logic that is needed; that mindset should be adopted globally and there should be a general agreement on how to best manage these finite resources…