elch: Sorry if I worded not so precisely: The time of the warning is important. Let me reword it.
IF the switch to alternate / direct law happens when you already doing something and get the warning at same time, unexpected results can be happen before you react to the warning.
The question is about a warning that lets you react before the aircraft actually switch to alternate law.
Carnage Matey: Of course noone would fly close to the limits in civil aviation, and even if we speak about military aircrew you need serious reasons to do that.
It would be bad if any protections would be significant in everyday operation, but when you are pretty close to an accident (due to unreliable airspeed data, etc) then you can be close to the limits.
The only other case where you are close to the limits is the "coffin corner aviation" and mostly above oceans...