Exactly. So if someone has antibodies the upside of the vaccine is reduced significantly compared to someone without. It is understandable they would want to weigh the more limited upside of the vaccine against the possible downsides. Same thing for the discussion in the mask thread about masking kids. Even if we agree that masking can help slow the diminish the spread, we want to weigh those benefits against the downsides of masking kids.
The recent report we have been talking about says in one part the chance of being re-infected for who had the virus vs someone who had the virus + shot is practically nothing. If those figures are correct then the downside would out weight the upside so no shot needed.
Now your position with regards to masks for preschoolers is solid.
I can say "get the damn shot" or "wear the damn mask" and understand you don't bury your head in the sand.