Quite some years ago, I went into a smaller electronics store in Germany because I had seen a nice notebook model on their website that had an SKU without operating system.

When I spoke to the clerk, he was completely puzzled that I would want a notebook without Windows. I can still hear his words in my ears: "But you need an operating system!" I tried to explain to him that there exist other OSs, but to no avail. I walked away from that purchase after imagining how support would go if I had any problems with the hardware.