This is something which is set to catch the lowest common denominator in new pilot [lack of] skill. "Mandatory" is a fuzzy term in this case, as it is more likely a club rule, than an actual requirement anywhere. It could also be insurance company based, but if it's the club rule, it is their plane, so compliance is not optional. It is very likely that this mandatory rule is being waived for known, very experienced renters, it certainly has been for me many times over the years.
If a less than 100 TT pilot is flying only one hour a month, they are barely maintaining their skills, and most of that flying should be airwork and circuits, as opposed to XC to maintain hands and feet skills.
If, on the other hand, a 500 pilot, who has regularly flown several hours a month for years, and keeps well practiced in all aspects of flying, takes a six week holiday, then comes back to rent a plan on the seventh week, that pilot will not need an hour dual, if any checkout at all.
Pilots with thousands of hours will become known in certain circles as not requiring checkouts at all. I have experienced this many times while renting/borrowing - there's the plane, go ahead....
If you are required to take the hour of dual, turn it to your advantage. Go up briefed with what you want to accomplish during that hour. As long as it includes some turns, slow flight, and a couple of circuits, you might as well get extra training that you like in there!