At 1 ms, the rolling shutter would allow a 1/1000 s flash sync. Leaf shutters have been around a lot longer than global shutters, and aren't limited to 1/1000 s. With a global shutter as with a leaf shutter, the camera is no longer a limitation (the flash power/duration becomes the limiting factor, but that still allows a lot more flexibility than a rolling shutter, even blazing fast one).I don't see any need for a global shutter. 50 year old technology introduced when readout speeds were in whole seconds and sacrificing whole stops of DR. The next R3 or R1 will break the 1ms level basically instantaneous readout. The R1 is already reading out faster than a mechanical shutter.
Not saying everyone needs that, but it will benefit some. Personally, I'll benefit from the bump of the R3's 1/180 s X-sync to the 1/400 s (in sync priority mode) on the R1.
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