Indeed... well spitballed Genkaku.
All the necessities of Buddhism are internal to ourselves - namely the Four Noble Truths and the Noble Eightfold Path.
You do need some external... I mean, otherwise you wouldn't have the bathroom... but only the amount necessary to do what needs to be done. You don't need 84000 bathrooms, even if you've got teenage daughters.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)