> It's not until you reach a level where everyone around you has a mastery of the fundamentals, that the meta comes into play.
At any given MMR bracket, everyone around you has a similar mastery of the fundamentals so the meta is relevant.
However, put someone with the fundamentals of a 6k+ MMR player into a 3 or even 4k match and they'll demolish everyone else even with a disadvantage relative to the metagame.