Aloofness toward strangers is absolutely correct for a GSD. Shyness is a disaster.
My Lexi mistrusts all strangers until they commit, then she loves them. Raff went through about a week of avoidance. It ended quite abruptly and he now loves all humans everywhere. Most of my GSDs, including my two K9s have been very people friendly. I like it, so it's encouraged.
Whether your GSD is a social butterfly or a more reserved type, he still needs a lot of self confidence. Genetics plays the biggest part, but don't underestimate the value of socialization and training.
Yes, different goals.
I don't want my dogs to be overly friendly, I want them to see me
as their source of interaction. If someone does approach, I want them neutral, and not having them think that all people are there for the dogs to be entertained or a pez dispenser.
I try to keep my dogs neutral to other people and dogs. Where we train, the dogs need to focus on their handlers then when it is allowed they are fine to be petted up or played with by other club members. My dogs are cool with that.
I took Gambit everywhere when he was a pup, he was absolutely fine in all situations, but never ran up to people or pulled me towards other dogs thinking they were his besties.
When he was about seven months, we went to a car show and the teenage 'queen' of the village came up to him wearing a tiara and gown, gloves...arms open like a robot towards him. That was the first time he ever tried to avoid anyone, and I didn't blame him a bit, lol!
Confidence is always key, confidence in the handler that they are there for their dog, they have their dogs back so the dog doesn't feel the need to be 'on' all the time. I learned that with Onyx, who does not have strong nerves and is fear aggressive. I had to prove to her that I controlled her world so she could have that weight lifted off her shoulders.