And has little to no impact to the pupils....
I'll start the ball rolling with ...Reinventing the topics frequently when the curriculum hasn't changed (yet) to avoid becoming 'stale', or to take on board pupil voice.
Biggest one for me, however, has been the legal requirement for the last couple of years to actively plan and prepare for the new curriculum that is only finally available now and won't be live until 2022 (Wales).
Reading and making sense of it all will also take quite a while, I imagine. Never have I read such a wordy document!