> The author did not test the DFU flow
I'd rather not. I'm not even sure that I have all the prerequisites on hand.
> I'm not sure why they're blaming the DFU port documentation.
1) The documentation says that macOS cannot be updated on the DFU port.
2) Switching ports allowed my macOS update to succeed after repeated failures on one port.
3) The 14-inch MacBook Pro with M4 chip is documented as different from all other models, but strangely, not the 16-inch MacBook Pro with M4 chip.
You don't present any alternative theory for the behavior, just assert that I'm wrong.
> You don't present any alternative theory for the behavior, just assert that I'm wrong.
Not the GP, but it is easy to refute your theory. Just do a DFU with the port indicated by Apple and it works per Apple instructions. I have personally tested this and can attest it works as intended.
I don't think one logically needs to be burdened to come up with an alternative theory for why your macOS update process to be able to conclusively refute your implication of Apple docs about which port is DFU being wrong.