If EMS in your area is starting IVs and pushing fluids on scene, then yeah, that's an issue. Plenty of time to do that in the truck. My primary goal is to gather all clinically relevant information I can, establish any needed access (airway, IV, or otherwise), and stabilize any life threats. In short, to set up the ED doc with the best chance of success (a patient with all the 'prep' taken care of, and a good, clear picture of what's going on.

I do think you're focusing too much on the dying/not dying distinction. There is a pretty wide range in the middle, and much can be done to help those patients (even if it's only to improve their comfort and reduce anxiety). There are a lot of patients who aren't going to die in the next couple hours who would still benefit from one or more of the interventions available on an aircraft (including a 500cc bolus).

"Lots of fluid" really isn't generally the standard of care for severe hemorrhage anymore. 500 mL may indeed be enough (if it's not enough, they're gonna bleed out anyway).

I agree 100% that any provider dealing with a medical emergency on an aircraft (or anywhere else) should be looking at the patient, first and foremost, and not rummaging through a medical kit...