That's certainly true for the individual, but remember these represent units, not individuals. Artillery and air support aren't designed to eliminate units, just weaken them, disrupt their cohesion, etc., making them easier targets for the ground offensive. In fact, the U.S. Army's fire support doctrine defines an artillery Destroy mission as inflicting 30% casualties. (Suppress is 10%, disrupt is 20%, IIRC). The prior implementation of non-lethal bombardment fit that quite well. Lethal sea bombardment is more reasonable, as I do look at ships as representing individual ships or small flotillas, and they can certainly be sunk from the air.