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It would take everybody to agree all at once to adopt a new standard
This concern has never stopped Shimano in the past
frankenbike-
And look how well that went 🙂 I think the 1" thread was a good idea even without the swing-pedal feature, but nobody bought into it. Using a larger diameter thread allows the use of shorter thread, which opens up options for reduced Q and thinner cranks for the aeros
TIL: There was a Deore DynaDrive crank/pedal as well as the well known DuraAce AX.
gbj_tester
Because the standards were already set in stone before people realised you could prevent precession by using a chamfer, instead of having to go to the trouble of cutting mirrored threads to cope with the mirror-image precession forces. Some early motor car and truck rims bolted to the hubs with flat head fasteners and handed threads before the better solution was proven. Like many cycle-related conventions, it's too late to go back now even when the convention is less than perfect, but especially with pedal threads because so many people use cranks and pedals from different manufacturers. It would take everybody to agree all at once to adopt a new standard, and you'd still piss people off by sending out new bikes with chamfered all-RH threaded cranks because so many many people bring their old pedals with them on new bike day.