For a second I was like "what month ends on the 29th???"

And then I realized you were being so specific as to include leap years one day.

strange. as far as i understand it we got rid of it because more frequent paychecks can make people subconsciously less likely to put money into savings, sort of how like living next to a supermarket makes some people cook less. it's not a law, but the unions pushed for it until it became the standard.