I don't understand why hard water would negate BS, as it never did for me. We probably have very different hair types. Greasy meant use more baking soda and less vinegar. Dry or frizzy meant the opposite. I certainly didn't need as much BS when I was living with crazy nasty hard water, though.
I totally understand what you mean about personal grooming, though! I had a shaved head in my teens and omg I loved it! And miss it so much. It would be not be a functional choice in the climate I live in now, though. lol Long hair that I can pull into a ponytail or throw a hat over is my best bet anymore.