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@gbj_tester
Look at a square taper crank assembled onto the axle. Do you really believe that there is scope to move it 4.5mm either one way or the other and not have "a lick of trouble"? One way it will be all but unsupported, the other the axle will be poking out of the crank where the bolt head should be.
I don't really care whether you believe it or not, but I've sat here with both axles (in fact at least 2 Campag and several Shimano and other JIS) in my hand and measured them at the same time with the same digital Vernier, both ends and both axes, and they are the same size.