The big impact is not a few days of delay. The big impact is the loss of trust in this vaccine in the general populace.
> I'm assuming that these decisions aren't political and are genuinely being taken for medical reasons. I mean, I sure hope so.
Obvious disclaimer: I'm not a medical expert.
However, I wouldn't be so sure it's a wise decision. I primarily trust Karl Lauterbach's [1] opinion on these matters, and he is actively criticizing the move on Twitter as an overreaction [2].
[1] Karl Lauterbach is the director of an institute for epidemiology at a German university and also a member of the German Federal parliament for the Social Democrats (who are part of the current coalition).
[2] Source (in German): https://twitter.com/Karl_Lauterbach/status/13714710614018949...
