...but, if it works properly, you get a tidy double scorecard to compare the two scores. I always get the matchplay score from it.
OTOH, it must be strokeplay at least for the first to play. If he'll stop playing a certain hole early, how might he know the "answering" score of his opponent?
Plus, there are no gimmes for him, no concedes. For equal chances, the opponent will have to hole out each hole for each chance of a win or a half.
Sounds pretty much like strokeplay challenge with an overlayed match evalulation.