The implication that we even slowed the trajectory isn't well established. It's likely, but not proven. Let's not get ahead of ourselves by pretending there's evidence millions would have died when there's not even a strong correlation between mandates (as defined by the Oxford stringency index database) and reduced death.

and nowhere that I'm aware of came close to running out of ventilators. New York, one of the hardest hit places in the world may have used a third of their available ventilators. They used around 1/2 of the ventilators they reported available to them in 2015 so it wasn't even close to being the limiting factor in healthcare.