DCWD said:Newbe question: why? I mean, I'd hate to get really wound and come unhinged, so to speak, but does this really help?
It is a race specific thing. It is more common to see clipless pedals in enduro racing than in sprint/TT races. In the latter events the security of straps is necessary, especially for standing starts where highest forces are applied to the pedals. The strap keeps the whole foot tight on the pedal, in clipless, you are relying on the shoe only to hold your foot down.
Don't forget that on a fixed gear, under high loads, a pulled foot means disaster (often tossed A over apex from the bike - believe me I know what that's like) as the cranks don't stop turning even though you want to, unlike a free-wheel bike where it is usually nothing more than a shin hit and/or crunching your nuts on the top tube (al la Lance in le Tour the year of the handbag incident).
I still use straps even though I ride enduro. I will probably go back to clipless, mainly for the aero advantage in pursuiting.