They say a rushed job ,can be a bad job. When there's a crisis one can go into panic mode, sometimes resulting into a rash decision, in turn making things worse, that was my first reaction on the fast turnaround of the vaccines.
If I remember sometime back last year, I said that I had confidence that sooner or later they would come up with a vaccine, there were a lot on here who said we may never get a vaccine, and had little confidence.
I got my confidence at that time, simply because a whole world of scientists came together, to work together, along with the idea of working on all three/ four stages at the same time, hence cutting the normal years of producing a vaccine down to months. That and the advancement of science has given us what we have now, a tool to fight with, and hopefully a tool that we can keep sharpening .