I guess what I'm talking about is the angle at which the blade cuts a hair. With a curved blade The Edge cuts the hair at a shallow angle which in my opinion is more efficient. Like you said correlation is not causation though.
The typical "blade angle" between the blade plane (of the blade popping straight out from the razor) and the shave plane (that spans across the guard span and the top cap) is 30 deg. Shallow blade angles, such as 24.4 deg with the PAA DOC, are said to be less efficient/effective, while larger blade angles are said to be more aggressive/effective at cutting hair.