Really? You are complaining about this? It makes a lot of sense, yet it is cool to complain about EA, so obviously they are the only ones to blame for ruining SW.
A company that actively lobbies to keep copyright laws from catching up with they mascot's debut, and yet it is so hard to believe they would have issues with Mariachi Solo or Pink Vader? They throw a bunch of books and characters under the rug so that they start anew, yet people expect EA to get a free pass to have Ninja Maul? One of the most protective corporations in the world licences a game and you are surprised it doesn't have so much as a palette swap for the most prominent characters? Did you thought this game was a chance to "express yourself" through cosmetics?
Let me explain how these licensed games work, since a lot of people love to throw shit at whatever target is available: Unlike examples like LoL or Overwatch, EA doesn't own the IP, Disney does, and they approve every single piece of art, model and voiceline. Sometimes they even provide the artwork, not because of saving extra work for EA, but to make sure the developers use that and only that... In any big budget licensed game, there are people (a mix of lawyers and specialists in the IP) whose job is to check everything and decide if it fits. If they have a problem, they have more authority than the game director to editorialize content. Most of the times, their job is not to comment on gameplay elements (they don't care that Darth Vader has the same hitpoint than Rey, whether a skilled Jar Jar could kill a noob Palpatine, or whether a trooper dies of one or two blasts to the face) and they don't care about the "plausibility" of having Ren and Vader on the same stage, the same way DC doesn't care that the Joker can fight Superman in Injustice, but include a blonde Leia and they will get involved.
At the end of the day, EA made a lot of bad decisions with the game, but if you want to blame someone for a licensed game not being customizable enough, you should look at the other direction. I am sure the developers and artists would love to make things more significant than a +2 blaster, but their figurative bosses are a bunch of lawyers with a lot of red tape.