It's not going to be enough to decelerate you in any significant way at higher speeds, but it's better than nothing and otherwise lost energy would be harvested to something much more usable (heating battery and/or cabin). And 14kW for those purposes is plenty. Even if you have to apply brakes to decelerate or maintain speed in deep down hill, it's a no brainer to harvest any energy available, especially in colder climates.
I personally would like to have more customisable regen options. For example if cabin temp below certain treshold, crank up all the heating elements while decelerating to maximise energy harvesting from otherwise lost kinetic energy. I admit those kind of settings could spiral out of the casual drivers comfort zone and perhaps better to keep it simpler