The article answers a lot of the questions I had about the reasons for keeping and shipping the Pfizer vaccines at such a low temperature.
However experimental these first vaccines may be, it is at least a stopgap step to finding practical and easily distributed and administered vaccine. Even if these first attempts just slow the spread and lessen the effects of the virus on those infected, it is a godsend. If it allows someone to survive and avoid living on a ventilator for weeks or months, it will be a notable step forward in the eventual control and defeat of the virus.