Yes, very nitpicky. MarineKingPrime didn't invent marine micro but he was known for it/popularized in the early GSL seasons before it became a standard tactic. SlayerS (the team) dominated MLG Anaheim with blue flame hellions and basically caused them to get nerfed if I recall.
I don't believe he's being that nitpicky. Brood War had a lot of micro, including marine micro...
Boxer (SlayerS_Boxer is who I think you are referring to, as he also played starcraft 2) was well known for having really insane marine micro in the community before SC2 even came out. Starcraft 2 was just way bigger in the west so more people over here associate MarineKingPrime with micro than brood war pros.
I guess what I was trying to say, in general, was that since SC2 required less micromanagement of your macro (auto-harvesting, etc), players had more free time to spend on unit tactics.
In GSL season 2, MarineKing showed that stimmed marines could counter banelings. Then the rest of the playerbase quickly adapted his tactics.
At MLG Anaheim (2013), the SlayerS terrans (ie multiple members of the SlayerS team) placed 2nd, 3rd, and 4th and destroyed all zergs with their blue flame hellion play.
Those are just two examples of the sorts of tactics that once discovered are quickly assimilated into the metagame and quickly go from innovative to standard play. So my hope was that AI could speed up the pace of tactical innovation.
