I'm not saying legacy vaccines are ineffective, but the vast majority of diseases were reduced to a fraction of their lethality and community spread long, long before their respective vaccines even hit the market.

The bottom line for me is, if I get bit by a rabid dog I'm getting a rabies shot. But I'll never ever get another flu shot long as I live. They're all getting reevaluated on their own merits against the threat of the disease.