I tried clipless years ago when a serious cyclist said they make him more efficient because he can pull up with the other foot at the same time he’s pushing down worn one foot.

I found that they DO make me more efficient not for that reason, but because it’s easier for the pulling back part of circular pedaling. On flats, one has to point the toes down and have very good traction on the pedal for this. I’d rather spend that energy toward circular pedaling.

I did fall once before I realized how much force is required to unclip. Very embarrassing and I’m glad it wasn’t in traffic.