But all parties are able to bruteforce the key, it's still just math, still obscured. The only difference is how complicated the math is, and how long the attac

But all parties are able to bruteforce the key, it's still just math, still obscured. The only difference is how complicated the math is, and how long the attack takes. Changing from a simpler substitution algorithm to a "real" crypto cipher IMO is still just as symmetrical, and still technically obscurity, only more complicated this time.