This is 100% not true. The MSR EZ Pull lever are much easier to pull than a factory lever and perch.
The MSR lever has 3 holes where you can adjust how easy it is to pull. Basically, the hole closest to the perch is the easiest pull and then gets harder from there.
Length of lever actually has nothing to do with how easy the clutch is to pull, the placement of where the cable is hooked up does.
That said, I can pull my clutch in with 1 finger. I use 6 heavy springs and have a lockup.