They make a good point - by showering daily, we are not letting our immune system build itself up.
What?! The immune system lies largely (if not entirely) inside he body...not the outside.
Fools. Your great great great grandparents -never- "showered". Nor did they ever use "toilet paper".
Appreciate the luxuries you have, for they ARE luxuries.
Luxuries indeed, no one needs this stuff, but our gransparents probably smelled more too.