Dunno, but it sounds like BS to me... There is a bit of 'play' in the drivetrain, unless you tighten your chain before every ride isn't there? So it's just unimaginable to me that people should wait for the drivetrain to push their foot through the dead spot...

Anyway, to me, riding a fixie during acceleration/ at steady pace feels exactly the same as a freewheel bike.

But then I'm an ass and I just started riding fixed.