As far as I'm concerned, that's just good tactics. Why shouldn't a player with a brain cell be able to economically counter brute force?
If air is already so easily countered as you claim, why would anyone feel the need for shield/Faraday traps?
The bomber shouldn't always get through.
You can also modify Raven behaviour so they don't dive. Yes, you then have to brute force the shield, but if the target is high value enough, perhaps burning even more Ravens is worth it?