The Functionality of the Sit-Up
Why are sit-ups used at all in WODs? It is my understanding that they're not particularly functional for developing serious core stability or explosiveness, and the back issues they cause with some people may actually make them detrimental. Wouldn't employing more explosive or stabilizing movements, like tornadoes or L-sits, be more useful? I have talked with serious MMA practitioners who exclude sit-ups entirely, even doing very heavy standing cable crunches instead.
I'm excluding GHDs from this, which seem to be a very different breed.