My first thought is whether it can still work its magic with smog, dust particles, bird dirt, all layered on the surface. Or are we going to have to wash our houses, instead of letting Mother Nature do it?
Might as well mention - several other scholars agreed with M Luther. Sort of a Generational thing. The old gang in the Church were rich, and the younger ones wanted to either get in on it, or kick over the applecart.
And, while we're at it, this is also how I learned how to pronounce 'Yosemite'. And, a year later, on a family vacation, I was the only one of us who didn't embarass himself. Educational, you bet!