I like that you're willing to take a controversial stand.

But you are wrong. The changes that you mention in history were organic. They replaced a system that was less good by one that was better. Nobody mourns the loss of the interkalaris.

This one was imposed top-down not for pragmatic reasons, but based on ideology. Which is why it sucks so much. Caesar didn't hire an ideologue. Neither did Pope Benedict. In Persia, it was Khayyam. It was the foremost men of the age who designed calendars. People stuck to them because they were good, unlike the work of the Jacobins.