It makes zero economic sense to expand facilities, hire more workers, set up extensive assembly lines and supply chains, only to do build planes for 1-3 years and then close down. The Manufacturer will set up the most efficient assembly line in a given time frame based on how many orders it gets from customers. Consumer goods like MacBook do not apply to the same logic to defense contract manufacturing. Why would HAL overproduce 100 fighters per year if the IAF will only take in 300 fighters? It can't scale up from 0 to 100 immediately, it will start maybe 10, 1stt year, 20 next, 40, then 100. It takes many years to scale up production, if order book is too small there is zero logic to produce it in such short time frame, the facilities will be unused and many people will need to laid off and it the company will lose lot's of money. This is why Lockheed does not produce 1000 F-35/year for a 3000 order book but only ~100-200 per year. This make sures the assembly line and supply chains are operational for many years which makes back the cost of setting up such expensive facilities.