If those 4 extra days of embargo would not have caused a total PR disasters on Intel's side will eat my socks. This wouldn't have become any better given another week of time.

The fact that Intel is rumored to have know about this since June lends credence to your belief, however if that week would have let OS vendors have updates ready, and cloud providers already patched, then it would be less of a disaster. There's a certain amount of flailing about when details are released earlier than expected, and vendors don't have a answers or instructions prepared.