> The point is that it's something objectively easy. Once they find (in this case, given by me) the correct instructions and follow through, they can easily do it by themselves again.

This is true of most things in life. It is very easy to make compost, it is very easy to grow carrots, it is very easy to graft an apple tree onto rootstock, it's very easy to hang a door and it's also very easy to replace the break pads on your car.

Once you've done it, that is. And once you know what tools you need. And how to use those tools. And that you actually have those tools.

Codex, Zed, the like are all tools that you need to know exist and you need to have and you need to know how to use. It's the same thing as a wrench, a break bleeding kit, or some graft tape.