It makes sense that vaccines need more careful assessment before rollout than treatment pharmaceuticals. When the medical infrastructure has reached triage grade saturation, even coin toss treatment candidates could become rational if they can run in parallel to conventional treatment. Exposing the still healthy to a vaccine is an entirely different risk calculation.
A reasonably opportunity to throw money at the problem would be to fund speculative production ramp-up for likely candidates ahead of approval, this should not be left to the invisible hand alone.