Now just a minute . . . Sidewalk Bubbles IS in the Constitution . . . somewhere . . . over by the 1-gallon per flush, abortion, penumbra, and privacy stuff . . . really . . . I seen it there . . . !
Truth is new toilet design has improved the process such that no matter how much water you used in the older toilets, you won't get as reliable a result as you will with the newer toilets.
I changed all mine out about a year ago, and would not want to go back.
This is one case where government meddling has led to a better product.