That one instance when you do need to accelerate quickly without the car car limiting you can be a matter of life or death.

If I get in a car, I expect consistent behavior based on previous performance. If the car pulls a "I'm sorry I can't let you do that Dave" and arbitrarily changes behavior when it feels like it, bad things are going to happen.

In most cases, I'd rather lose control and slip and slide around on/off a road than get flattened by a long vehicle merging into my lane because my car limited my acceleration.