Combat Reflexes represents being hardwired for danger. Instinctive reactions are a thing that people, especially adventurers, do develop over the course of a dangerous career. However, combat reflexes as it is gives far too many bonuses for the point cost. Instead, the advantage has been replaced with “Combat Hardened”.

Combat Hardened follows all rules for combat reflexed, except for the +1 to active defences, and costs 10 pts
To reiterate:

Combat Hardened 10 pts
“You have extraordinary reactions, and are rarely surprised for more than a moment. You get +1 to Fast-Draw skill, and +2 to Fright Checks (see Fright Checks, p. 360). You never “freeze” in a surprise situation, and get +6 on all IQ rolls to wake up, or to recover from surprise or mental “stun.” Your side gets +1 on initiative rolls to avoid a surprise attack – +2 if you are the leader. For details, see Surprise Attacks and Initiative (p. 393).”