I think you're zeroing in a bit too hard that word as you see it. You're forgetting that, unlike most people, Clark finds out he was left orphaned later in life. That's also the knowledge he takes going into becoming Superman and wearing the crest of a dead house on his chest. And most importantly that's when he learns that there's no one else like him anymore. And for a while that knowledge defines a large part of him. It's only really after he starts to make a life for himself and become less guarded that he feels adopted on a planetary scale. The term and the feeling associated with are things that each individual has to work out on their own. Doesn't matter what incarnation, Clark, well after being adopted and even being Superman, has a journey to feeling like he's part of this world rather than being a visitor. Him having the courage to reach out to Lois and share everything he is with her is him moving past being a visitor.
I think that's what Strange, and, ultimately, Bendis is getting, and I think that's why always works well for Superman down to the conceptual level.