You're forgetting coordinating at scale, and giant piles of money for parallelization of the building the manufacturing infrastructure. You think regulation was holding us back? How about the infrastructure to make the vaccines?

No I'm not forgetting about that. It's just that manufacturing was never the time constraint on how fast a vaccine could be produced. It's regulatory time. The manufacturing process was also shortened (and parallelized, as you pointed out), but you can see from this chart that the main savings was shortening a 4 year regulatory process to 6 months. https://media.defense.gov/2020/Aug/13/2002476369/-1/-1/0/200...

Consider the meaning of necessary vs. sufficient conditions. You're confusing the two.