The modularity of the supply chain is part of the challenge, as Bunnie illustrated. You could have interchangeability at the chip level or OEM level, but still

The modularity of the supply chain is part of the challenge, as Bunnie illustrated. You could have interchangeability at the chip level or OEM level, but still have the same bad actor tampering at the foundry, chip packaging house, part distributor, SMT factory, FATP factory, 3PL, retailer, or any of the shipping companies between those.