Introduction of this critical damage mechanism would not harm f2p players. The random damage mechanism has little visible effect, for weapons like thunder or railgun, the chance of you launching one extra shot to eliminate opponent is negligible. However this critical damage mechanism would be different, as it ignores double armor, which thought of balance the game as well as nurfs ap or some other augments. But introducing that critical protection thingy is really bad idea, honestly this game really need a visionary game designer, focusing on short term gain is truly stupidity.