I totally understand your reluctance to expose, but I think you're over playing it.
If you have someone like Han who can take a hit and reroll dice, expose is excellent. 4-5 dice with a re-roll each is amazing. If you can swarm him to get Garven's focus token, it become the single most lethal offense in the game, followed only by a focus + target lock HLC Firespray. If you have the means to avoid taking damage, it only gets better.
I did say that there are pilots and lists that can make Expose work, and Han+ Expose + Luke (crew) is certainly a lethal combination. Of course, that's going to cost you 57 points or more; Marksmanship+Gunner is also extremely effective, and it's 3 points cheaper with no defensive cost.
EDIT: Trying to keep this on topic, I suppose… the defensive counterpoint to the OP's statement about attack and defense dice is that a ship's Attack dice are likely to come into play once per turn (twice at most), where its Agility dice are likely to be used multiple times per round against a smart opponent.
I am not sure you understand what the previous poster way saying, he said expose was only good when you could take another action, but in it self it's never a better choice then focus.
I get that he said that… but Vorp spends a lot of time talking about what a waste Expose is. And I get why he says it… he just he overstates it.
And yes, ATT dice are where the game is at. A target lock is almost always the best action you can take; specially if you can get more ATT dice. IMO, target lock + focus engines are the most brutal offensive force in the game.