Ouch! You're right.. it's probably all cosmetic... but still hurts!
Hopefully at the most it just needs a good buffing. Or if the clear coat is cracked, they can fix that easily too, good as new!
Take a look at your bumper *very* carefully. While the plastic has some memory, it's also very soft and mold-able. Compare your bumper-to-wheel well-to the seams of the hood, or clearances around the headlights, on *both* sides of the car. If one seam is off from another, then your bumper may have compressed (if even slightly) at the impact. The only things holding that bumper are in-place molded clips or.. teeth (if you will). If one of those got stretched, it too could affect the seam tolerances (and don't let a body shop give you any crap about "within tolerances". If the gap is noticeable to a regular person's eye.. then it's still wrong).
And don't let them get away with a bad tape-off job around the wheel well molding either. That's a serious design - vs - sustainability issue in the engineering of the fender wells and bumper. Seems like, in the factory, the fender wells are painted, and *then* the wheel well moldings are put on over that so that the paint looks to be "underneath" the moldings. Problem is.. those suckers are molded to the body and don't just pop off. So, after-delivery body shops have to try to tape up really tight to that molding line. Otherwise, you'll have paint bleed up on to the molding and it will look very bad. And don't let the body shop say something stupid to you like.. "Well we can just touch up some black paint on the molding to cover where the paint bled on to it", either! (sound like words from experience in this same situation?)
Oddest thing about the paint on the wheel wells...the rear wells look to have been painted after the molding is in place on these cars. But, knowing what I know now, I would say if I saw a paint line *above/over* a molding on the front, I would know the bumper or well had been repaired at some level. That is of course, unless on the newest of models, Subie got smart and realized what a headache this is for body shops (including those in their own Dealer Collision Centers) and started painting them all after the moldings were put on. Don't know.. I'm not an expert. Just going off of what I experienced recently myself.
Well, good luck and keep us posted! Hope you get her back good as new very soon!