They are currently stumped by situations that humans are OK in. They are not "already far better" in all situations. Even if they are better on average, my poin

They are currently stumped by situations that humans are OK in. They are not "already far better" in all situations. Even if they are better on average, my point is that this is not enough. If the world was run on pure rationality, they would have only to be epsilon better on average to be adopted. In the actual world, they are going to need to be very much better, and have very very few failure cases to be adopted.