It's not so easy for the individual to do that. The skills necessary for pre-modern life are only taught by being raised by a group who lives that life. Nearly all such groups have been destroyed -- and even if you wanted to, you couldn't go join a tribe at the edge of civilization as an individual.

Not to mention that in many areas, it's not possible to make life by hunting and gathering because biodiversity in the natural environment has been destroyed. So, it's not really possible as you say.

Even though it's not really possible, such bullshit is worth giving a bit of thought, at least.