And of course it's good for phones to make them worthless to steal, or else they'd be hard to use in public.
Software that locks out people with physical access from resetting a device is not an ethical, or effective, way to prevent hardware theft. It's dystopian.
I honestly believe locked-down consumer devices are the next step in corporate power consolidation after cloud services: Control is just as firmly in the hands of the corporation as with cloud, except now it doesn't even have to pay for bandwidth or energy costs - and costs for hardware upgrades turn into revenue!
On a similar note I very much look forward to the day when entertainment providers leverage these so I can say to Netflix, et al, "I would like to watch a documentary about XYZ, narrated by someone that sounds like Joe Schmoe, and with the styling of SomeOtherShow".