Good point, although....they do make "constant mesh" trannies that are not synchromesh. The 1566 and 1586 IH come to mind. They had the gears in constant mesh and had sliding dog collars that locked the gears to the tranny shaft instead of the gear itself sliding on the tranny shaft, (was suppose to shift easier). I don"t know if those trannies had spur or helical cut gears. Also, the gears being syncroed by the syncros in this dual clutch setup would not be under power at the time the would just have to be synced to shift for the next powershift. They may have held up that way, I don"t know. Good point. Sure seems more doable than the powershifts of the late 50"s and early 60"s though.
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