This is why freighters have a leg up single-man fighters, to be sure. But ship-to-ship combat is rarely about one TIE fighter vs. one other ship. TIEs are deployed in massive numbers in combat to overwhelm the opposition. So while you might "get one," there are several others in the minion group that still have the advantage over you.
A single crewed vessel that tries to Gain the Advantage is one that's not shooting at you for a turn. While he's doing that, just shoot him and be done with him.
I think that's what Gain the Advantage is for
Armor, Defense rating, Hull Trauma, and System Strain are better representative of straight mechanical advantages. I say let the dice handle the rest.
It's why you have a wingman - you let one of them bait the target into following them, and then the wingman swoops in behind it and destroy it while it's too busy trying to go after your wing.