30 fighters is a rather small force. Their goal was to have their fighters sneak past the defenses all the way to the exhaust port.
As a matter of facts, through your logic, the Endor ground battle was a head-to-head battle because the Empire knew that the Rebel would attack and were in fact waiting for them.
Again, on Hoth, the Snowspeeders met the AT-AT head-on. The objective IS military. Gee, ever heard of tactical retreat? They saved their troops so they can regroup and restrike the Empire later on. Not every move you make must end in immediate victory.
Why the hell are we arguing about this anyway? This should be about tactics in SW RTS2 and there's only one person here who wants a limit on possible tactics.