Being able to do damn near anything makes a computer sound more like electricity than a toaster or a blender.

People buy toasters not because there is a default one but because they've used one in the past and got used to the idea. We need to focus on getting the idea of possibility of RSS-like functionality across, not on a nitpick like lack of a "default" client.

It would be an interesting twist to see RSS explained as "Twitter for any website."