What if you are interested in developing your own OS (a task that would have been monumental but may become trivial with LLMs in the future)?
Why is the proper level the OS? Why not the browser or the hypervisor?
Or perhaps manufacturer should remember your age? What if hardware is resold? We would need a hardware cadastre! A global hardware cadastre would unite all jurisdictions in a power bloc eventually. It starts with daily computer/laptop, then domotics, then digital door locks, and before you know it the bloc-global hardware cadastre becomes authoritative, and the reference for property ownership.
Is there even a proper level?