Sonny’s Mom,
Thank you for defending high tensile. I have it and love it, but as you mentioned, keeping it HOT and doing the minimal annual maintenance required are critical. I became a convert when I had a big dumb TB colt run in it full tilt and bounce off it unharmed. I wouldn’t use it for broodmares and foals, but other than that, it’s terrific.
However, I do agree with the OP that the high tensile brace in the corner is a concern. If you were also going to have a strand of hot wire on top, I wouldn’t be as worried, but without a strand of hot wire, yes, the high tensile brace would worry me, particularly if you have horses on both sides that are likely to visit over the fence. I have nothing to add to the suggestions for different bracing methods, you’ve gotten lots of good advice.
You’re paying for the fence, the contractor needs to listen to you and do it your way. And your neighbor is a flarkin’ idiot. Because you’re a woman you should just roll over and let the contractor do what the want? I don’t think so.
When I explained to the contractor that put up the board fence on our road frontage that I wanted the boards on the inside and the posts on the outside, he looked at me and said “Oh, horses, right? You horse people always want the boards on the inside.” End of conversation.