(so many posts...sorry)
I don't want newer riders thinking that Speedplay Zeros are bad for track. THEY ARE GREAT FOR TRACK!
What I wrote above only pertains to the preferences of many stronger track sprinters who do a lot of standing starts. BUT there are/were even some sprinters like Steve Hill (elite national champ and masters world champ) who used Speedplay Zero Track Specials...without straps.
Ther are LOTS of pedals that I would advise against using on the track (SPD, Eggbeaters, any MTB pedals in general, older LOOK pedals, Speedplay light-action, etc...) But, not Speedplay Zeros.
The above writing is arguing about the finer points of which pedal may be better suited for a rigorous standing start in events like the Standing 500M or Kilo.