I think you are missing the point. If I own the province and my TA owns the city and you bomb the city, my planes on FC should have a chance to intercept you on the way to the city. That just makes sense. How are my planes (that are covering the province) know that you intend to bomb my forces in the province vs. my TA's in the city? Not to mention that bombers are over powered in this game, I think this helps a small amount, after all it takes a lot of setup, or just dumb luck to even have a situation like this.