Where Most Prepping Falls Short:

[Devonian]

The hunter gatherer mode of survival is fine 'if' there is sufficient space freely roam around and hunt, and yes eating naturally occurring wild foods is again a good viable option which I think everyone is aware of and prepared to adopt.

But as you say if there are hordes of zombies roaming the countryside, the ability to hunt is going to be severely restricted and to roam around yourself, you are simply placing yourself in exactly the same position as the general populace.

As for living off of foraged produce, then again this really isn't as easy as it seems and for the long winter months, given the mass industrialisation of our countryside, then you will find it hard to consistently forage sufficient amounts of edible produce to sustain you. There simply are not the quantities of wild foods growing in the countryside that there were even 30 years ago.

As for indigenous people they developed their skills and knowledge over periods of 100's of years and even then their old and the weak would not survive harsh winters and disease, so following a nomadic hunter gatherer role is something that I personally would only ever resort to as a last resort.