Yes, I think that's one of the main things our beloved cat forgot to take into account.

Another would be: Though the "vaxxed/unvaxxed studies are hard to do because confounders" argument is true, I find the "a universal vaxx recommendation could never be justifiably made without thorough life-long vaxxed/unvaxxed studies, at least absent direct threat of death or lasting injury" position at least equally compelling. This of course leading to having to decide case by case.