I'm sure its not all like this, but a pretty common practice on South Texas hunting property is to take bulldozers and scrape crossing senderos out of the thick brush, place a stand in the middle of the crosspaths and corn the four lanes. Lots of cactus, cedar and mesquite, few large trees.
It seems some people are confusing fenced property with high fenced. 1000 acres of normal fencing is free range and is a pretty good size property to hunt. 300 acres of free range land is pretty good hunting as you basically are benefiting from the surrounding land, as they are from you. 1000 acres of high fence is still a big place to hunt but without artificial help it will not be a perpetual haven for animals. Obviously, 10,000 acres and up would certainly be more capable. However, there are more and more small-acreage tracts being high fenced every day as landowners see a way to extract revenue from land that is basically scrub land. I've seen video of deer on a 300 acre high-fence that basically ran to the truck as they were fed. Great looking racks and a bunch of them. Two guys on our lease a few years ago took their sons there and 'harvested' some cull deer, 5 total if I remember correctly, and filmed the deer. I hunted in December on a free range 1500 acre tract. The owner drove me past 2 tracts some guys had bought and was high-fencing in, one 600 acres and one 800. The 800 acre tract was divided 300/500 with the 300 reserved for breeding. Besides these tracts being too small, any deer on that land at the time the last section of fence goes up was just taken out of the natural bloodlines. There's still a lot more free range but you see more and more high fences going up every year.