Either I don't understand or we need to talk the same language.
Again, knowing the terminology is helpful when it comes to knots. One knot used to terminate E2E cords is called a scaffold knot, which is one half of the double fisherman's knot. A scaffold knot is fine on most kinds of cordage, climbing lines for sure.
Some hitch cords, like Ocean Vectran or Armor Prus, are made with a core of high modulus (low stretch) fibers. For ropes with this kind of core, it is recommended that you add another turn, making making 1/2 of a
triple fishermans knot. The core on these ropes can be pulled thru a scaffold knot under extreme loads, but not with the additional wrap.
This really shouldn't matter for E2E cords because you aren't applying crazy load to the knot, but I on those specific ropes I tie the third wrap for extra security/ peace of mind.