> Not if your goal is to isolate the effect of vaccine rather than to do some kind of fuzzy emotional handholding to people's instinctive, non-fact-driven subjective feelings about what groupings are important.

I mean all the groups I presented have some sort of merit to them based off research (delayed 2nd shot), at least observational studies (previous infection then vaccine) or guidelines from CDC on other viruses (previous infection). Doesn't seem emotional.