regarding the fences of south africa, my impression:
where i hunted, in the zulu/natal region in zulu land, the fences were a necessary evil. the place i hunted was pretty large, had a high fence around it for a purpose. the land on the other side of the fence was denuded by domestic animals, goats, cows, etc. on the inside of the fence it was regular bush africa.
without the fences, there is no doubt in my mind that the grazing would encroach onto the ranch/farm and also, the locals would poach many of the animals on the edges away from the lodge. as it was on two separate occasions we had incursions of poachers on the property, with their dogs.
so, i suspect the density of the human population and proximity to the game animals on the farm has something to do with the need for fences. they say fences make good neighbors and i would agree with that statement regarding fences in SA. i suspect hunting truly wild places is different but similar. i saw fences on the place i hunted, but did not feel like it detracted from the hunt at all and did not feel like the animals were "penned up" for shooting.
one property we hunted on the Pongola reservoir was huge and was comprised of 10 properties adjacent to each other with ele, hippo, rhino, buffalo etc. on it. it felt like wild country to me and i never saw a fence. we had to have a rep of the farm with us to make sure we stayed on our side of the property when hunting wart hogs.
anyway, i suspect owners of said properties would not have them unless absolutely needed because of the high cost of fencing, electricity and upkeep. my 2 cents.