For those of who us came up in the Old School it was traditional for both road and track racers to put in winter base miles on a fixed gear, still do >40 years on.
Riding a FG on the road was a tool to develop a powerful supple high cadence pedaling technique with both spin and grunt on demand.

Oddly enough cycling is a pedaling sport, having an efficient pedaling style is more important than any hardware doo-dads.
That being said riding FG on the road isn't for everyone, it takes a serious commitment to technique, a properly set-up machine and seat time.

-Bandera