I expect a bigger impact on gameplay apart from that rather minor scoring thing.
The 75 might get the best town killer in game. 60 rockets + a very rapid firing 75mm gun. I just took one to a town to test it, and the results were quite impressive. Two or three (not to speak about the usual hordes) will chew up a town very quickly with a rain of rockets first, and then a rapid hail of 75mm HE shells. A Sherman 75 will shoot 10 rounds in 36 seconds, while a Panzer takes 54 seconds and a T34/76 82 seconds for the same number of rounds.