I still think the longer clubs should have faster meters, otherwise there's only reward, no risk. The benefit of long hitting clubs is obviously longer shots and the further you can hit a club the harder it should be to do so. Accuracy and forgiveness are presumably based on real world clubs to a certain extent, the only way to make these clubs a bit trickier is to make the meter faster.
I'm no master of the ding, far from it, but I accept the odd wayward shot from my i15's because the reward for getting close to a ding is a good shot that goes a long way and ends up pretty much where I intend. I'm amazed the new TM irons and the R11 clubs have relatively slow meters, I'd have made them the fastest out there.
A better result requires a more accurate input, that's the same in most aspects of life.