Now that I've hit that part: yes yes yes they cracked the nut. :)
The addition of that game mechanic creates for the player a new type of puzzle in addition to the raw crafting puzzles: pattern recognition. Coming up on a jumble of nonsense, mentally parsing it out, and recognizing you have a template that can be applied to it is actually really fun (and even more exciting when you're doing it in realtime because some monster is bearing down on you).
The addition of that game mechanic creates for the player a new type of puzzle in addition to the raw crafting puzzles: pattern recognition. Coming up on a jumble of nonsense, mentally parsing it out, and recognizing you have a template that can be applied to it is actually really fun (and even more exciting when you're doing it in realtime because some monster is bearing down on you).