oh I get what you're saying and wouldn't hesitate to imagine someone in such or similar companies salivating at the prospect of being able to guarantee obsolescence. They'll no-doubt sell it as a security feature "if your phone gets nicked" etc etc, and then find that unfortunately the update to OS level+2 above your initial one has an unforeseen compatibility issue that unfortunately, and entirely unintentionally (honest guv) bricks your device. Sorry about that. Warranty? Oh that was 2 years mate. Last week as it happens. Unfortunate coincidence no?