The question of this thread seems to have come down to why one company, Hasselblad (the only maker of a system without an FP shutter AFAIK) does not invest in designing and deploying a focal plane shutter system at least twice as fast as any other 645 system offers, and considerably faster than even the glorious somewhat smaller format Leica S system offers, to be deployed in addition to the continued offering of leaf shutters in most lenses, in order to potentially allow a few future wide angle lens designs to cost less by omitting the leaf shutter.
At a guess, it is because the cost of developing that imagined new FP shutter technology would be too high compared to the lens cost savings and the new sales attracted to Hasselblad by the ability to offer those few less expensive lenses. But does anyone here have any evidence on the costings on this? I doubt it.