Erm, the ride height doesn't affect the weight distribution. It might alter the corner weights (wedge in oval racing), but the ride height changes at each corner are very small to achieve this.
Ride height is something you alter directly, and with intent, to work with everything else - spring rates, circuit layout, kerb profiles, roll centres... It is a shame that LFS gives us "Ride height reduction" which is fairly meaningless, whilst nKP simply lies (i.e. set the F3 car to 15mm front ride height and it'll be bottoming out immediately.
Yes, it is necessary to know the height specifically - how else will you ever repeat the wonderful handing you one day find yourself with if you don't know how the car was set up?