DotTune: AF tune technique without taking photos

CraigBennett wrote:

I think Nikon's statement in their D800/e manual on AF Fine-Tune is very strange. On page 338 they state "AF tuning is not recommended in most situations and may interfere with normal focus; use only when required."

When I first read that....WT? What situations do they recommend and what situation would it be required? They really do not say. How may it interfere with normal focus? (Edit: They state "the camera may be unable to focus at minimum range or at infinity when AF tuning is applied")