I agree. It dates back to the 1976 counter-revolution. From the reports about people overstaying 1, 2, 5 years the police don't make use of it anyway. I'm sure some bright young bureaucrat got a promotion from suggesting it, but practice shows it doesn't have any value. I don't mind doing it too much, it keeps the Immigration office people familiar with my face, but it takes a couple of liters of gasohol to go and come back.