It is not the simple. Increased FPS does not always and automatically compute to greater KE and penetration.
True, but when coupled with that 450 grain arrow that he mentioned it should prove to be one effective setup in terms of penetration capability.
As many of the others have stated there are some advantages to shooting a fast IBO rating bow but you have to weigh it with the disadvantages. For one, though the bow may be fast with an IBO weight arrow, just how fast is it with a mid to heavy weight arrow? Some bows show a definite preference in terms of efficiency for a specific grains per pound ratio. If speed bow "A" is fast with a 350 grain arrow is it going to be still reasonably fast with a 450 grain arrow in comparison to a bow with slightly more forgiving characteristics?
Two, with a shorter draw length the shorter brace height bows are not quite as critical to shoot but you still have to concern yourself with hunting situations and the potential for arm slap.
Every couple years I get the urge to shoot a rat-trap speed bow but after shooting it for awhile I eventually give it up for something more moderate in terms of design and more accurate in my hands overall.