Damage Negations seems ineffective compared to other defenses for the same cost. For example, consider two possible characters, who each spend 30 character points on defenses:
The first buys 8 levels each of Resistant PD and Resistant ED, for 24 points, and 6 levels of Knockback Resistance
The second buys 3 Damage Classes each of Physical Damage Negation and Energy Damage Negation
When faced with a normal damage attack, either physical or energy, the first character's defences reduce the damage by 8 Body, 8 Stun, and 6m knockback. The second character reduces the damage by 3 dice, and thus-if I did the math right-by an average of 3 Body, 10.5 Stun, and 6m knockback.
When faced with a killing damage attack, either physical or energy, the first character's defences still reduce the damage by 8 Body, 8 Stun, and 6m knockback. The second character reduces by 1 die, and thus-again, assuming I did the math right, feel free to correct me-by an average of 3.5 Body, 7 Stun, and 3.5m knockback.
The first character seems like it does significantly better, exceeding or matching the damage-negation based character in everything except marginally in stun against a normal damage attack and knockback against a killing damage attack.
Did I get something wrong? Is there some other benefit of damage negation that I'm missing? It seems strange that it would be so much inferior.