Re: toilets:
Teflon by itself is softer than a plastic cutting board. (~~White cutting boards I restaurants are Teflon~~ edit- yes I’m an idiot, they’re HDPE, not PTFE).
You don’t want soft and easy to cut/mar where there’s poop. You do want slick, but you also need a slick nonporous surface that could last a hundred years or more.
Ceramic is the trifecta of hard, slick, and durable.
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