Oh Jesus please don't tell your going to actually argue that low TTK shooter take as much skill as high TTK shooters. Almost every competitive FPS player will tell you, higher the TTK, more skill it takes to play it. If higher TTK didn't make a shooter harder/more skillful why is adding more health the fundamental basis for ramping up challenge even in PvE? If TTK didn't matter, why don't we just make Hive Majors 2-3 shot kills? TTK doesn't matter right? Let's make Vex Minotaurs 3 shot kills? Hell let's make bosses take less bullets to kill too since TTK doesn't matter right? TTK is one of the most basic principles in game design to ramp up difficulty lol, not just in shooters either, in any game.