Bathrooms,cooking,
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Check out ancient Rome or Greek plumbing history
YES
It saves you going outside to a little shed
You don't need plumbing as many cave dwellers and folks in the UK and other parts of the Crown have no need for indoor plumbing as they are now becoming more Muslim majority nations they no longer have to compete as a world power and in the next generation only the truly religions will conqueror the crown.
In most civilized countries where there is indoor plumbing and codes that protect the citizens from cross connections