The fact that Go commentators talk in terms of local strategy and narrative and anything other than the end-game from the very beginning made me feel fairly confident that Go was not a game that humans would ever reach optimal strategy levels at.

And in addition to that, winning condition is also extremely fuzzy. Looking at the Master games, I couldn't tell why he is wining at all, granted I don't know much about Go.

So if it requires some experience just to recognize a winner, and as far as I know sometimes even professionals can't tell for sure who is wining, it's pretty safe to say Go game is just too complex of a game for humans to come to optimal strategies in any reasonable amount of time.

You only need to do the math and look at the huge exponent to figure out that this is indeed the case.