Good. I am glad you wrote that. So we agree that playing a positive expectation game isn't enough to be a winner. You also need the proper knowledge. Do you also need variance to go your way also? Of course you do.
And now about this:
You need the same variance to win at -EV games too, don't you?
That brings us full circle to my first point: you have to leave the game with a profit in order to be a winner. And that is a rule for both +EV and -EV games.
Frankly, that's the content that would really be meaningful on this site. A little more basic common sense.