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The firmware is based on iPhone boot process from my understanding, and simply does not have space in ROM to implement boot from external storage. The rest of

• amelius 3y ago
  Yes, but the decision to use this firmware was made by Apple. This is like saying my software did not work because it was based on an incompatible version of some library. Maybe so, but that is a bad excuse. Implementing systems is hard, and like the rest of us, Apple should not get away with bad excuses. And this is even more true because they control more of the stack.
  • pjerem 3y ago
    OTOH, the current implementation works and is sufficient so Apple could easily decide that it’s not worth modifying firmware that already works to solve an inexistant issue.
    • amelius 3y ago
      That's how you end up with a UX that works only for programmers (see e.g. Linux in the 90s).
      • pjerem 3y ago
        We are talking about booting from USB. On a Mac M2. That’s literally the most power user feature of a MacBook. The 3 users of this feature on this planet are already happy that it’s even possible at all. The only thing Apple could do is to document this clearly like adding a text in the boot drive selector.