Despite what Boeing says, anyone leaving the automatics engaged during a Windshear escape manouvere is perhaps being a little bit too trusting IMHO.
True.
On the other hand pilots may believe their skills on that day may bring a better outcome.Maybe,maybe not.
Never experienced a strong downdraft shear in real life.
What i can say is during low altitude phase,(take off/landing)with AT engaged already,disengaging it is not making use of your resources properly.
If GA thrust is not enough at that time and the ground is coming back at you then yes firewall the damn thing.