True, although for the same reasons that "fail fast" is sometimes better than the alternatives, a "leap hour"---being much easier to perceive than a leap second

True, although for the same reasons that "fail fast" is sometimes better than the alternatives, a "leap hour"---being much easier to perceive than a leap second---may be easier to work with. At least then you'll know if someone's off because they didn't leap, vs some sort of clock drift or other error.