Hypothetically, how would you respond to Omega launching the 321 Speedy with a white dial? Do you believe the significance of the 321 safeguards it from such a release?
The 321 has been around a lot longer than the Speedmaster, both with and without white dials, so I don't understand your 'significant' point? Omega could just as easily release a vintage inspired Seamaster chrono, or a pre-Seamaster chrono as is mine here.
I don't think the modern 321 movement has been given exclusive black dialled Speedmaster (pre) pro designation?