It is a sad fact that although electricity is fairly simple and logical, most people regard it as incomprehensible black magic, mostly because its invisible.  My comment was brought about because your post read (to me) as if it was promoting the same mistake that has appeared elsewhere many times that "twice the voltage is half the current" without mentioning that that was to get the same power out of differing loads.  Your more recent post mentioning different motors clarifies your intention.  Thanks.