On the track brakes were/are not allowed or needed.
I've run at least a front brake riding FG on the road for >40 years as all of my teammates did. An open public roadway is a different environment than the track and requires a different set-up.
For the last 23 years I've run a rear as well in my hilly terrain.

The Magical Thinking of "Flow" or "Zen Control" is mythical/non-existent twaddle and no substitute for an actual front brake to be used as required along with proper foot retention and a track style hub.

-Bandera