If the rest of this thread is to suggest anything, it is that you don't appear to understand that Rope Systems can fail well within their SWL. Its not about the rope itself breaking, its about the system failing. A Karabiner with a weakness, maybe dropped, maybe a factory fault. Maybe your firetail lets go. Maybe your anchor wasnt such a great anchor after all...
I dont understand how, when there is a safer option available, its not taken.