Even if we had the tech at reasonable prices - who gets to decide the horse “simply pushed off” the obstacle vs was dangerous in their impact? The line between sliding over a fence and a crash is razor thin. I don’t think cameras can determine what might have happened if the fence wasn’t pinned - and then we are left with more subjective judgement calls for the ground jury or whoever.
I’m not saying that cameras on fences is a bad idea - I’m just pointing out that getting the camera there is barely the tip of the iceberg if we are going to start assigning different values to triggering a pin. I don’t have an alternative, I just think there is more to it!