So by definition, a golf ball that is -quote- "optimised for a 105 mph driver" is not also optimised for an 8-iron for 75mph? It's impossible to have one optimised over the other because the launch characteristics (not least the actual ball speed) are completely different - speed, launch angle, spin rate - these are the 3 fundamentals of ball distance. A golf ball hit with a driver does not have the same effect as that hit with an 8-iron - therefore it cannot be optimised for both. If you choose a ball that has been allegedly optimised for the driver at 105mph, it cannot transfer that quality to a ball hit at 75mph with a different loft and spin rate - that is a physical fact.
Numerous balls have been tested over the years with both robotic machines and more importantly human testers. Not one ball has ever been optimised for any one individual for a variety of shots. If distance were indeed the primary goal, we would all be using rock hard distance balls with little spin - which of course we don't.
Coupled with this, every ball within the market leaders range achieves a peak distance hit under optimal conditions of around 4 yards of each other - hardly enough to make much of a difference to anyone, let alone a touring pro. What the touring pro is actually looking for is a ball capable of being controlled with good spin and feel on ALL shots.
And lastly, if you took Callaways 90 mph ball and hit it with a 105mph swing it travels a total distance of within 2-3 yards of the correctly "optimised" ball other under test conditions (yes we have performed those tests) which begs the question: how are they optimised for swing speed again?
If you need any further proof, you have to ask yourself why the market leading ball (for some years now) has never found the need to be optimised for one player or swing speed over another, simply because that is not possible and furthermore there is no need.