Nope not at all, for example I personally would put the Expanse firmly in the genre of sci-fi. The major themes it explores centre around its setting; it doesn't happen to exist in a futuristic space setting; the entire show would cease to function as a concept without it. Major plot lines exist specifically to explore the "what-ifs" of that fictional future. And honestly, while I acknowledge it's intelligent and extremely well loved by its fans, it's one that I'd have trouble recommending to people that aren't big into sci fi, for that reason.
But compare that to something like Firefly, where's it's basically a heist/western that happens to be set in outer space.