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.
“I hope, Anuruddha, that you are all living in concord, with mutual appreciation, without disputing, blending like milk and water, viewing each other with kindly eyes.” (MN 31)
What is the final conviction that comes when radical attention is razor-edge sharp? That the object of the mind is mind-made (manomaya). (Ven. Ñāṇananda)
"If you have always believed that everyone should play by the same rules and be judged by the same standards, that would have gotten you labeled a radical 50 years ago, a liberal 25 years ago and a racist today." (Thomas Sowell)