But in medicine starting treatment doesn't have to correspond with a calendar event. A 'dose' of education is much larger. It would be very difficult to switch

But in medicine starting treatment doesn't have to correspond with a calendar event. A 'dose' of education is much larger. It would be very difficult to switch curriculum mid semester, because one is getting better results at the midterm. Talking to teachers, one of the biggest complaints with the last decade of education reforms, is that they have to redo their curriculum every year. Not only what they are teaching changes, but how they are evaluated. Everyone knows that education is broken, and "has a plan to fix it". But their plan is just a new set of arbitrary requirements. They rarely let a system evolve naturally, and instead opt for a yearly rewrite. Its a huge bureaucratic burden that's constantly changing. The IT equivalent would be you need a minimum of 6 hours of training each time a library you use releases an update. The update may require you to use a new language. Using the most up to date version is required by law.