The interesting question is how much physical effort was required to forage and hunt, and did that necessitate rest due to the lack of nutritional value offered by said food. Reading Guns, Germs, and Steel right now. The value of agriculture would have been that it allowed food to scale so that other members of society could specialize in something, develop knowledge, and use it, including metalwork, soldiering, scholarship, etc. That type of specialization was not possible when everyone was focused on being a hunter gatherer to survive, especially given that nutrition options were poor in most parts of the world compared to where agriculture did take off.
