True enough Dun! To be upfront though, due to the large number of bulls we stand, our fences are pretty solid. All of our pens/paddocks are 3 guard rails lined with cattle panel. The perimeter fence is 5 strand high tensil, most of the time hot. The goats honestly just never venture far enough out to bother the property lines. In our family, we believe that if stock (horses, goats, cattle, ect) are fed properly, they have little reason to pressure a fence, and if they still do, the pot is in the yard 7 days a week ready to load 'em out.
As far as the original topic, we don't have fescue issues up here, so Im no help there. The goats do help maintain pastures though and if you are trying to clear some scrub, they are the way to go. Most of the time, you can pick up some skinny, neglected crossbreds at the sale barn. Buy them cheap, worm them, turn them out and put them to work. When you are done with them, fatten them up with a 14% sweet feed for a week or two, the turn around and sell them for a profit. There are of course variables affecting success in this, but if for example someone buys a run-down farmstead, it would be a quick way to improve grazing conditions.
Also, goats need chelated copper. They do not absorb it as needed from most general mineral mixes.