To me, Smith is like a child in an adult body or more aptly, an immature young adult. He cares more about his curiosity than his responsibilities. That's who he is throughout the story. There's the politically correct word where Smith labels it "research" and in a sense it is true for what he's doing, but from the story, it feels like he's always doing research in service of his curiosity, rather than vice versa. And honestly? Is it important to write down the history and culture of a people? Yes, but important enough to risk your life? No. This isn't some holy grail revelation in what's Smith doing. Imo, it's honestly a very poor case of someone trying to risk his life for it. But heck, without Smith, there wouldn't be an exposition for this story.
But anyways, the mangaka mostly end up with happy endings though, so I suspect this is just some roundabout drama to spice up the story, which I think, is a good time for it as the story has been getting a tad stale (in terms of story development).