A lot of the deer hunters here in Texas (maybe elsewhere) are going to be surprised when they show up to hunt and find out how many hogs bloomed out of the spring rains, additional spring foods, and all the additional cover that came with it.
The idea of minimal obstacles to keep out hogs sounds pretty good because you don't want to keep out young deer. Plus, the lower fences pose less trouble for humans to access and pose less of a shooting obstruction, particularly from ground level. An occasional interloper isn't too bad, but sounders, even small bachelor groups, can wipe out your feed in no time.