> Powers of 2 tend to be superior for more factors. Four weeks means we can easily reason about halves and quarters of months. Five weeks means we can only easi

> Powers of 2 tend to be superior for more factors. Four weeks means we can easily reason about halves and quarters of months. Five weeks means we can only easily reason about fifths of months. Sure, but the nice 4 week period is not actually anywhere close to a lunar month, so the "groupings of 4 weeks" part makes sense because 4 is a nice number, but the "7 days to a week because 4 of them will add up to a lunar month" thing is just not even close. We're not talking about something like leap seconds where the drift is slow relative to a human lifespan. 28 days is a whole day and a half shorter than a lunar month.