You show me that video and i'll link you one that does it way faster than any of your x5 necros. For example: Cliff Side. Can your 5 necros finish in less than 5 minutes? Because let me tell you a meta comp can. Evidence below.
Oh but they are super lite thats not 99% of the player base. Your missing the point. Meta > Your 5 necros or 4 necros and druid or whatever. I know I sound condescending. But I really wish people would not complain about running the most efficient way possible.