I haven't had a chance to review all of these, but pretty much every one I've looked at is problematic, e.g. issues due to feeding newborns strict vegan diets,

I haven't had a chance to review all of these, but pretty much every one I've looked at is problematic, e.g. issues due to feeding newborns strict vegan diets, weird restricted diets like raw foods, differences in levels that aren't necessarily below unhealthy thresholds, effects on non-essential supplements, and other pathological cases. I could easily find a list of a hundred studies of problems with pathological meat eating diets, e.g. eating lots of salami, pure meat diets, etc. You should filter these to be relevant to normal vegan diets rather than try to overwhelm with a gish gallop. I challenge you to find a study showing health problems in vegans with a balanced normal diet.