Balance has been a fail forward game as it should be. Try to fix the issue and when you don't get it 100% you try again. In X-wing due to the nature of the product you aim for 80-90% in your fix as an accidental 150% fix is very hard to go back and correct. You can easily increase power levels by adding new upgrade cards or ship cards but dialing it back down is a challenge.
The aim should always be to make as many of the components of your game viable. In a CCG the "put in dumb cards to test deck building skill" is personally to me an excuse for lazy design. Sure, you can actively design bad cards to negatively affect people who aren't indoctrinated in the game but that precludes you were perfectly designing everything in the first place so without the "traps" you could simply assemble decks of random cards and auto win. This is clearly not realistic. It's just an easy way to pad out a CCG expansion, that and endless reiterations of the same stuff.
You could of course design products for specific use in say Campaign formats which were not competitive even in Epic play, but that is a product they have yet to embark on and really, seems needless. Even the Senators shuttle could easily be a useful ship with lots of crew slots and a cool title.