Occasional source of havoc - yes. Permanent source of havoc - no. Vaccinations have ramped up in ways no one has every seen in history. And lots of lessons we

Occasional source of havoc - yes. Permanent source of havoc - no. Vaccinations have ramped up in ways no one has every seen in history. And lots of lessons were learnt during the first few waves from all the blundering that happened. Nothing is static and predictable about systems that learn and change from day to day. Stick that on your Fridge. And re-examine how your prediction is doing next month.