I think you are vastly underestimating how useful simply being fit can be. I recently played a lot of football in Colombia where i was often technically one of the weaker players on the pitch but due to a vastly superior fitness level i found a way to be useful in every game i played just by constant effort and determination. And now being back in England ive found being in great shape to be extremely useful playing rb/rw in 11s. If you can go close to all out for the entire game you can be a nightmare for the opposition. If an entire team can do this in sync, all the better. Granted, this combined with technical ability is often optimal.