The criteria is the criteria. Has been the same forever. Go ahead and move the goal posts if you like.This is not convincing at all.
Think about the argument you are putting before the reader: you are saying that Pfizer is a "failed" vaccine because it has relatively low efficacy in preventing infection.
Tell that to the hundreds of thousands, perhaps more, worldwide who have not died and not been hospitalized because they have been vaccinated.
A vaccine that prevents serious illness and death is most certainly not a "failed" vaccine even if it has zero % chance of preventing an infection.