About your anchor, since you like to go into minute details, aren't the sling and/or cordelette that make up the master point static? ...we calculate the point of lowest resistance. In that way, you have the stopper with a rating of 10 KN, the sling that you tied with a knot at 18KN less the knot 12kN, the rope which is rate at 10 KN. So , my sling was not my weekess point.
In sport, the fall of a climber on a static sling can generate enough energy to cut the sling. In general, they use a 22KN sling on a 24 KN bolt. for that reason, tying with a sling in sport is safe, but in some dangerous situation....it is not safe in trad.
Ahhh.. he does like going into minute details. Especially the type that are not very helpful to new, intermediate, or expert climbers (aka everyone).
More important than all the kN talk of his first paragraph is recognizing that you attachment to the anchor should be dynamic if possible (like tying in with the rope with a clove hitch), vrs. just clipping in with a nylon sling like is still very common in both trad & sport climbing.
As for the 2nd paragraph, the force doesn’t “cut the sling”, but possibly could break or “snap" it. Not to be nit-picky but saying “22KN on a 24KN bolt” is not useable in any kind of risk management way... it is confusing at the best what your point is there...
Finally, to say “tying with a sling in sport is safe... but not in trad” is a perfect example of how you take a complex issue, add complexity to it by talking about pieces of the puzzle that are not as important (breaking strength of a small nut “10KN), then over simplifying it to “this is ok in sport but not in trad”.
Heart in the right place, but your delivery of most climbing techniques is not decipherable by your audience.