Well, Apple didn't really attempt to speed up animations per se, Apple simply made the control of the movement in the animations part of what the "reduce movement" accessibility option controls, so that with it enabled the movement in the animations is reduced, which, is in fact the actual case. The whole speed aspect of it all is more of a related but an extraneous item that people often bundle with the movement of animations, so that's why that topic surfaced here.
But, again, Apple didn't set out to do anything about speeds of animations specifically, just the ability to reduce their movement (which in turn decreases their duration, and seemingly increases the speed of some interactions at least by a bit).
