> Building an origin server for a CDN is a different task to building a regular server. The focus for cached resources is getting the byte size down, not serving a billion requests at once. The CDN can do that.

I think this put perfectly in words what I've believed for some time, but failed to compile into words...

However, having once you've gotten your cached resources down to the smallest size, you can now also optimize for serving a lot of them at once. :)