> Alternatively, just make it illegal to ship any kind of initial bootloader as part of a CPU's/SoC's mask ROM in any computing device that is marketed as a general-purpose one.

Funny, I have a related proposal: make it illegal to sell hardware and distribute software. Or at least, if you distribute software, we don’t buy your hardware. The idea is to force hardware companies to release the complete user manual for their hardware, and incentivise them to simplify and standardise their hardware interfaces.

What I did forget was forbidding them to arbitrarily restrict what kind of software can run with their hardware, which they could if the hardware hashes the software & verifies a signature before running it. But it would seem your separation between CPU and storage takes care of that.