Well, I guess the guys at OME are just stupid. They go through all that trouble for nothing. They just must like all the extra inventory and supply problems just for fun. And all the folks running coilovers that change out springs to dial in their suspension are just stupid. And all the testing the automakers do for their suspension can't read.
If your suspension moves just 2" in normal driving then you would need to add another winch up front to get the same compliance with the heavy spring. The harder the spring the harder the ride. That's why they make different spring rates.
Or else the entire automotive industry might know a bit more than you do about this. European cars ride firmer(harsher) than US cars because they use a harder spring. Less potholes let them do this. Try driving any vehicle that offers both a stock and performance or heavy duty version. Then tell me spring rate dosen't matter.