How many times has the dealer not reset the service minder?
Actually the law reads that the requirement is on the one offering the warranty to prove that lack of maintenance caused the issue. If you were asked to refute this presumably a court or arbiter would accept paper records.
Also, just because the service minder was reset proves nothing. Everyone should just reset it and skip the service altogether.
Of course no one works harder than Ford to lock everyone out of right to repair and deny warranty claims.