Using the reticle for ranging is old hash; the modern LRF has rendered it obsolete 99% of the time. The main advantage of a FFP reticle is not estimating range. Making and calling corrections in windage and elevation is but one application where it shines over SFP reticles. It's also excellent as a dual-use reticle. On minimum mag they often provide a simple, bold, featureless aiming point for use at close range or low light. On mid-max magnification you get a fine, info-laden ruler for precision or LR applications.
I rarely have my scopes set to max magnification for LR or precision shooting, depending on mirage, lighting conditions, FOV required, target size, etc. It sure is nice to not even have to THINK about where the mag adjustment is set, for my reticle to match my turrets, and for the measurements be true to claim.
You can't compare the SFP NF to a FFP Razor AMG. Apples and oranges.
