I don't know anything about the mineral content of water being a problem for skin, but maybe. Soaps don't lather up as well when there is a high mineral content. I have a water softner installed and when the brine tank has run out of salt ( brine/salt tank used in the water softening system) I can tell when I shower, soap doesn't work as well. My city has well water supply, well water usually has high mineral content. My moms, one city over, has water supply from river and is much softer water, they don't soften their water. You even use less detergent washing clothes with soft water. My sister place they have their own well...really hard to even get clothes clean, detergent/soap hardly works/lathers up in really hard water.
Yeah...I have a really hard time getting my kids' (two messy toddlers) clothes to come clean. Plus, I have to use tons of fabric softener, even then, any clothes I wash more than a handful of times start to feel stiff and uncomfortable.