Additional advantage of FF is that we can select where in time we really want to play.
Based on various deformations on the wheel the pick point from spin to spin may float.
Therefore the best result is achievable by setting FF to predict at the time where sharp change is avoided. On some wheels with high deformations, prediction earlier then time of picks point (knee point) hardly that would produce any advantage.

The knee point is created when the centrifugal force that keeps ball spinning drops below centripetal force of gravitation which is puling ball down. At that moment friction in between side of the ball and wheel frame disappears therefore the ball deceleration drops. Deformation would create similar effect as on tilted wheel and cause various ball speeds to end up close to same drop point. The drop point can be anywhere but the final result loses proportionality with measured ball speed. It will never lose it completely but at some conditions the effect may be so intense that it is not worth playing.

If the deformation is at track where the ball touches it as marked with brown arrow it may cause the same but depends of intensity it may also cause the ball to constantly drop at that particular point. That of course is good but we need to apply tilted wheel approach to take advantage of it.

I highly trust FF’s measurements, because it is accurate measuring device as much as it is possible to be. But we as users need to understand what is possible to do and what isn't and why. Our advantage is that we can chose when, where and how we will play.