What do you think? Do we really need to eat vegetables? Based on GCBC it appears we really don't need them but I suspect most primal/paleo folks are hanging on to them as the last vestiges of CW and for variety and for "insurance".
Then again, there is no way to know for sure that Sisson et al have it 100% correct so keeping veggies in the mix gives us a bit of insurance I guess. That and some carefully selected supplements.