>The intense reactions from the initial shots means that our bodies were severely lacking in defending itself from the virus

That doesn't sound right. The mRNA vaccines contain no actual virus, so more severe side effects are caused by a stronger, not weaker, immune response. A more typical pattern is mild reaction to the first shot (when the spike protein is totally unrecognized), followed by a much more severe reaction to the second shot. Reaction to Pfizer shots was generally milder due to the lower dose.