For normal loads, yes. The problem people are trying to solve here is that users hit the relaod button. A lot. And if you hit the reload button, that will se

For normal loads, yes. The problem people are trying to solve here is that users hit the relaod button. A lot. And if you hit the reload button, that will send If-Modified-Since for everything on the page, no matter what Expires says, because the user intent is to ignore Expires headers. That's what the immutable thing is about: indicating that even in the reload scenario the Expires is authoritative and no If-Modified-Since request should be sent.