Some of the smartest people I have worked with smoked pot daily and before work. one is a head of engineering at netflix, another a head of IT at a big firm...
some of the highest performers I have ever worked with, and pot was a daily for them.
And many top politicians, business executives, authors, producers, and musicians were alcoholics. Your claim of having met high performing pot smokers is meaningless.
i think for a small % pot will have a positive impact, but in general there is a reason it is considered a recreational drug. If you put 1000 linux kernel developers in a stadium, do they do better work sober, or if the stadium is hotboxed with some exotic kush. (maybe 5%, 10% see gains... but does the majority receive buffs to their concentration, analytical skills and memory?)
Maybe the question has a different outcome if you're measuring a stadium full of Designers with Adobe Illustrator open, trying to brainstorm how a logo looks?
some of the highest performers I have ever worked with, and pot was a daily for them.