This idea for the hull mod is a lot like hardened subsystems but works differantly ( like augmented egines and injector). The idea is for frigates that equip this hullmod to have longer Cr time and slower degradetion but comes the penalty of limiting peak performance meaning your ship won't be as fast or be as efficient. Now you ask why equip this hull mod unstead of hardened subsystems? Simply put it would cost less OP and/or may be more efficient way of slowly cr degradetion.
(Note: depending on how much cr is saved it and how much OP it costs it may not work with experimental ships like the hyperion due to there experimental systems nature and not having a concrete point that systems will work longer from.)