Originally Posted by
OakLeaf
But you need to be able to take a hand off the bars and signal that you're stopping or slowing or turning, or signal obstacles to other riders. Sometimes you need to be able to signal stopping/slowing very quickly in an emergency situation. And you need to do it with your right hand on the brake, not in the center of the bars.
Being able to do a slalom course with no hands isn't a specific skill you'll ever need, but being able to handle your bike when you're bumped by another rider or a vehicle, or if something/someone runs out in front of you suddenly, those are skills that can save your life, and balance drills are how you get there.