I don’t mind different grips, but within each of these club types, the grips must match:
The different grip types in these categories often gives me a semi-conscious tactile reminder of the slightly different swings for the club types, if that makes sense.
My iron set is: 6-9, PW, AW and SW. According to the 85% figure (8i relative to driver) that has been thrown about, my distances seem in line with the norm. I am guessing that with most golfers perhaps 9i would be the club that would be half the length of a driver on average.