People care about seasons and regularity a great deal. I know that it’s warm in the summer, so I’ll book a beach holiday then. Moving my vacation plans by a few weeks every few years to ensure they’re still in good weather would be a nightmare. Not least because people would probably want school holidays to match that time period.

The calendar feels very illogical and made up compared to most measurement systems but there’s a reason why they are what they are! A much more realistic proposal would be to just give people every other Friday off. Or work one Friday a month, something like that.