German cars in the US have option packages, you can only choose from what they offer. Sure, if it's not on the lot you can order it or request an allocation or something, but you cannot specify the precise options you want if they're package-only.
Many Subaru options are dealer-installed so the only option you'll have beyond what comes bundled with your trim package is things like roof racks and fog lights that can be installed by a dealership employee.
In Europe (for European brands I mean) you don't have such an issue, as long as you are willing to wait a long time to have it delivered, ( I know people that have waited 9-10 months for their VW only because they wanted a specific color) ).
I think, over the years, shoppers in the US have shown time and time again that they simply don't care, so these choices have been taken away from those of us who DO care.
I get it. It's easier to shift vehicles if they all conform to some common spec because then there's nothing that makes worlds different. You pick this spec or that spec, end of story.
But I've played this game too many times with dealers and I just can't be bothered any more, which is why I drive an 8 year old Volvo that is good enough. Would I like a new car? Of course, I'd love a spanking new truck, but the glory of driving off the lot with a brand new vehicle that's not quite exactly what I wanted just isn't worth the loss of the 30% of value as I leave the lot and certainly not the tediousness of talking to car sales people for a day while they fuck around upstairs trying to stress me out.
I'll bring my laptop and use your WiFi to work. I'm quite comfortable helping myself to your endless tea or water from your service department waiting room while I'm in your showroom. No, I'm not giving you the keys to my vehicle which is parked outside your lot on the street so you can't box me in, and here's a photocopy of my driver's license which is plenty adequate for your needs, the original stays in my wallet. Now fuck off and do your job and if you're not back here with the keys, ownership papers and plates to a new car matching the spec I specified by the time I'm finished this user story, you won't find me still sitting here. You wanna play games, play them with someone else.