What defines this supposed "maximum scale"? No manufactured product has ever been found to have a maximum scale. Many complex products are produced in the bill

What defines this supposed "maximum scale"? No manufactured product has ever been found to have a maximum scale. Many complex products are produced in the billions per month. The only limit is willingness to invest money to hire more people to build and run more factories in parallel. Those budgets were ultimately set by governments, unwilling to spend a few billion to save millions of lives and avoid trillions in economic damage.