Will that mindset (and nothing else; no other skills or strategy) take you to the top of Overwatch League? I think even as someone who doesn’t appear to understand much of the depth to shooters, you still have a rough idea that “shoot stuff, don’t get shot” falls woefully short of the myriad of skills you’d need to be the rank 1 player in the world.
Well it’s that accumulation of skills that determines a game’s depth.
Summarizing Chess as “just take the king” doesn’t magically turn Chess into a shallow game, because it misses out on all the nuance (and it’s that nuance that causes Chess to be a deep game).