If they didn't I believe there would be less negative comments in this regard because some people will subconciously find it looking more like the ps2 game.
This is why there is the customisation part of the game. While there have been few new costumes anyway, Jin's 3rd costumer has changed, some have a 3rd when they didn't before. And like usual, Yoshimitsu has changed completely again. But customisation allows you to change your character, even the basic main colours they have (I think, haven't properly gone through it other then for Scenario to make my characters a bit more beefy).