The sync speed can be cheated by using an electronic first curtail shutter, which is what Phase does to get 1/1600th, and even more so if it required f/8 or smaller opening. The biggest hurdle to doing the faster sync speeds is the whole trigger/remote timing, thus the builtin transmitter.
While I'd love a line of cheaper f/5.6 - f/11 glass, there's not enough money to be made to make up for lost revenue from the existing glass.