If you think about the suspension as kind of a modified fulcrum, it starts to make sense. Look at any video of a vehicle suspension in action, and you'll see the wheel may travel >3" up or down, but the movement at the shock/spring is much less. That's because the length of the control arms (lever) adds to the 'outboard' movement at the wheel. I'm sure one of the engineers on the board will come in and correct my terminology, but hopefully that starts to explain why it's not a 1:1 ratio.
Perfectly clear now, thank you for that :bravo: