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If you want to make the saves system more logical, then why not roll to hit, then roll saving throws, any failed save then roll to see if they wound the model.

Because you can't be wounded if you armour does its job and stops you getting hurt.

To you original question about bolters getting through force shield but las cannons not. If you have ever watched Stargate SG-1, the Gould shields are responsive to only attacks that deal a high amount of force like a gun, but you can throw a knife through them because the knife doesn't hit with a lot if force.

Or they can choose when to activate their shields in 40k