There's a world of difference between locking up your front wheel and not using the front brake at all. A reasonably skilled cyclist is able to use the front brake effectively without locking it up.
We are in total agreement. I was illustrating my point that a unicycle rider avoids flipping because they never use the full braking power (lock up the wheel). The gyroscope controller won't let you - you can only brake as hard as you can counterforce (throw your entire body weight hard backwards). As soon as the gyroscope senses a change in angle, the P.I.D. motor controller compensates.