It's a thing, just a very niche thing. There are fancy walter filtration systems that put minerals back so it's more controlled. I suppose this is useful when you're living in America, where everything is chlorined to death.
You clearly haven't tasted coffee or tea brewed with hard water. And I don't see why yeast or fish wouldn't be more comfortable in some range of mineral composition than another.
It's a thing, just a very niche thing. There are fancy walter filtration systems that put minerals back so it's more controlled. I suppose this is useful when you're living in America, where everything is chlorined to death.