There are lots of interesting ideas floating around – decreasing each dose (sounds more reasonable than giving just one), prioritize older v. essential, etc. I don’t think there are easy answers.
It well may be that Biden’s centralized approach may pick up on a good idea. There is a risk that it will be a bad one. So far, US does as good as UK and a little ahead of EU. Other than Israel, nobody found the best path. It well may be that it is just noise who many people were vaccinated by now: after figuring out the system, most of available vaccine will be used, and we will be limited by manufacturing for months to come.
It is a clear test of integrity for Biden: he can say that he continues/improves what was done under Trump, or he can continue saying that everything was wrong under Trump, and he will be do everything better. He has an incentive to follow the second path – things are getting in place, more people are getting vaccinated, so he can just surf the wave and claim the success