Wait, are you suggesting a hardware lock/kill switch on every part? That is a lot of “all they have to do”!
How would that work exactly? A semaphore switch on each part that locks it every time you lock the device? If we were to assume that is even possible, the unlock time would be rather interesting, I’m sure. I would expect that the precise timing that would be required would end up with quite a few bricked phones.
But, if we just simply assume that everything somehow works, my personal experience has only involved reusing parts from devices that have broken or died. The one broken screen I had would have allowed an unlock before tear-down, but I still turned off the phone before working on it, which locked it. If they added a “Release Security” option, I guess that would have worked, in that one case, but usually I only tear apart items that don’t even start, and I don’t recall ever knowing beforehand that my electronics were not going to start next try, so wouldn’t those all become e-waste, unless you never ever turned the security feature on?
Sorry, I’m probably overthinking this, but when you said “all they have to do”, all I could think of was that this sounded incredibly complicated to actually do.