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iirc it's because the original movements were made by Zenith which caused a supply-chain issue, and consequently The Waiting List.
It proved successful so they continued it.
I will say I totally changed my views on it after seeing on someones wrist in a meeting - it just works, kinda like the way a speedy does. Whereas away from Instagram irl I think those vintage patina GMTs look a bit shit.
I don't get the Dayton thing. So many better looking chronos. This is of course my opinion entirely. But to go from the Daytona of old to the Ceramic... jeez. They were just so much better.