I don't use foot retention. I've got a brake. I don't slip off the pedals no matter what speed I'm going. I don't skid. I start in traffic while you are busy trying to click in or having your cage on the wrong side while you are awkwardly trying to flip your pedal. My shoes are my work shoes. I can go get on my bike now.

If you slip off the pedals, you've forgotten how to pedal without foot retention. Yawn, on the pull up/power all the way through. Like hairnet said "unweigh your feet and keep moving smoothly" and this can be done without retention.

Simplicity.