The Expanse takes pains to treat space travel, combat, and so on in a hard sci-fi way to the point of making it seem rather mundane. But you're right- the point of the series is about the human element, which is actually relevant to the OP-
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Okay, so what you’re really asking me there is if this is hard science fiction. The answer is an emphatic no. I have nothing but respect for well written hard science fiction, and I wanted everything in the book to be plausible enough that it doesn’t get in the way. But the rigorous how-to with the math shown? It’s not that story. This is working man’s science fiction. It’s like in Alien, we meet the crew of the Nostromo doing their jobs in this very blue collar environment. They’re truckers, right? Why is there a room in the Nostromo where water leaks down off of chains suspended from the ceiling? Because it looks cool and makes the world feel a little messy. It gives you the feel of the world. Ridley Scott doesn’t explain why that room exists, and when most people watch the film, it never even occurs to them to ask. What kind of drive does the Nostromo use? I bet no one walked out of the film asking that question. I wanted to tell a story about humans living and working in a well populated solar system. I wanted to convey a feeling for what that would be like, and then tell a story about the people who live there.
>> Okay, so what you’re really asking me there is if this is hard science fiction. The answer is an emphatic no. I have nothing but respect for well written hard science fiction, and I wanted everything in the book to be plausible enough that it doesn’t get in the way. But the rigorous how-to with the math shown? It’s not that story. This is working man’s science fiction. It’s like in Alien, we meet the crew of the Nostromo doing their jobs in this very blue collar environment. They’re truckers, right? Why is there a room in the Nostromo where water leaks down off of chains suspended from the ceiling? Because it looks cool and makes the world feel a little messy. It gives you the feel of the world. Ridley Scott doesn’t explain why that room exists, and when most people watch the film, it never even occurs to them to ask. What kind of drive does the Nostromo use? I bet no one walked out of the film asking that question. I wanted to tell a story about humans living and working in a well populated solar system. I wanted to convey a feeling for what that would be like, and then tell a story about the people who live there.
https://www.orbitbooks.net/interview/james-s-a-corey-2/