Don't use a Rope Walker system much. I prefer the Sit-Stand aka Frog Method better.
Never try to set my TIP so high that I worry about it breaking, but I have had it happen twice while SRT ascending over the years. Once fell 6', the other time 10'. F*cking stupid mistake each time trusting the size branches that I did. Only thing is that in each time the reason that I went forward with the ascent, is that I knew that I had really good limb below my TIP to mitigate a fall. Still not a good idea to plan on having a TIP break.
Also in each case, I came down on my Croll (which as you know, is a toothed cam ascender) and there was ZERO rope damage. Sean, I know that you are more experienced than this, but if climbers are more concerned about damaging their ropes using cam ascenders than they are about having their TIP's break out, than they are really misguided and are listening to the wrong people.
Take if from someone who is a 2 time member (though I am not proud of it) of the "Halfway to Hell Club".