How much walking are you guys doing that it hurts when you walk in the house
I would assume that you also can't walk outside on the asphalt and concrete if your back is that bad.
But I can't see this being a reason to choose a flooring for the vast majority of people. How to clean, looks, colors, texture, longevity and personal choice would be the reasons to favor one over the other IMHO.
Personally I like the tile and or real wood choice for living and entry areas. I'm OK with the bedrooms keeping the rugs.