We might be seeing more scales and information rolled out with Age of Rebellion. For the purposes of EotE, in theory , we don't need to simulate a lot of big capital ship combat (that was explicitly one of the things they said at the announcement of the EotE at GenCon) and maybe it's omitted here for simplicity. The same could be true of the vehicle scale, too. For EotE, we need to be dirty scoundrels and unscrupulous bounty hunters or daring scouts on the outer rim. I'm not saying these issues shouldn't be considered and discussed and balanced and published, but its really not the main focus of this game. For the most part, things work fine for what we need.
-WJL