The vaccine harm was very much batch related for Pfizer. The anon’s on the chans had a spreadsheet early which had batch numbers and contents analysis. Batches were very different. People were going back to the vaccination cards and seeing if their batch number was bad.
I’ve wondered how many of the Pfizer batches were actually spoiled when injected due to the storage temp requirement. Way too many people involved for stupidity and human error to have implications on outcomes.