Like how granular do we want to get? There was no time for primaries with finding multiple candidates who have time to prepare a platform based on new pollng information (also takes time) on what policies were popular and battling it out for a month which would have cut into campaigning time.
The Primaries where I live where held in June. My options for President in June where Joe Biden and Terrisa Bukovinac. What you mean is there was no time to hold a second primary. If the Democrats needed to hold a second primary, doesn’t that mean they fucked up the first one?