actually i would bet the opposite ... my mammut cordelettes become unreasonably stiff after 3 years or so of heavy use, while the half ropes stay supple and easy to knot much longer ... the wear from TRing with proper edge protection is minimal ... not to mention you should be replacing your cordelettes every few years anyways

well since were in a court of RC

i dont see any issues with 8mm half ropes, where one would use a 8mm cord ... and up here its cheaper to buy the half rope, in fact the beal rando at MEC is cheaper per meter than 8mm static up here $2.30 vs $2.60

its that simple

I'm not sure what "unreasonably stiff" or "suppleness" or the ability to hold a knot has to do with rope longevity from abrasion. Either you can see the abraded rope or you can't. My time spent top-roping, & jugging and hauling off both dynamic and static ropes indicates to me that the dynamic ropes wear faster. It makes sense, because the dynamic rope will stretch cyclically with the repeated loads caused by top-roping. Even if you pad the edges well every time (how many people really do that?!), there is still some wear against the abrading surface. Which will wear faster, something that stretches and repeatedly rubs due to that stretch or something that stretches a whole lot less? It's clear that you have a difference of opinion or maybe you just like to argue (I suspect the latter), and I doubt there is any real evidence either way other than anecdotal. I've already said that I agree that it will be perfectly safe if s/he follows the basic anchoring principles that you have repeatedly laid out.