The particulars are far less important than the logic behind them: efficiency requires recognizing that different types of days required different types of schedules, and working out the nitty-gritty in advance allows better use of whatever time you do have.
But logicrequires judges to follow a tortured path of first determining that female circumcision is medically unnecessary and deprives women of future sexual pleasure, while male circumcision has some medical justifications and does not unduly deprive men of sexual pleasure.
If you accept the logic of the optimal currency area approach, the world requires a proliferation of currencies, so that every area subject to shocks has its own.