Yep. if you need to fight against a raging pandemic, then quickly as possible (as quickly as is tested to be safe, quickly as makes a significant difference) is the over-riding concern.
That implies we thought about it in the US, but we didn't really, and our public health people seem to be completely inflexible about everything. The schedule we used for vaccines is just what was done for their trials.
> The schedule we used for vaccines is just what was done for their trials.
There is a reason for that - what's being deployed is what has been tested. You could work out an optimal schedule, but that might take years of trials, and meanwhile people are dying.