So why do people want low kill times

Listening to that vid as I type this. But wouldnt more hp require more skill? Hear me out? So instead of just being able to pop in on a dude and delete them immediately, you need to a) actually think about what they will do because they get more of a chance to react b) you actually have to keep aiming for longer (when talking about raw mechanical skill). I guess its kind of a disconnect cause he talks about the frenetic nonesensical bs that is cod. I hope I managed to get my idea across atleast. (Unless you reccommended me that video as a way of agreeing with what I said or part of what I said but somehow idk if thats it.)