More like never letting your child ride a bike with training wheels because falling off builds character, and when they grow up they're bound to be falling off

More like never letting your child ride a bike with training wheels because falling off builds character, and when they grow up they're bound to be falling off a lot and need the callouses to protect them. Did your parents skip your childhood vaccinations on the grounds that a bout of polio or tetanus builds physical strength? Or did they prefer a more gentle introduction to let your immune system become accustomed in a protected, simplified, environment?