If it were me doing it, I prolly would too just because it's only gonna take a minute and I'm kinda neurotic that way. (I also tie my shoelaces with triple box knots just to be certain they won't come untied by themselves, and I put stamps on envelopes with epoxy for the same reason.)
But, I wouldn't stand and argue with a contractor that tells you it isn't necessary, cuz he'd be right.