[Tuc or Prinz]
Hmm, I think you are seriously exaggerating.
Neither Tuc nor the Prinz is what I would consider a decent snack. The Tuc is just way too dry and there's always the danger of a dust cloud forming when you bite into it. The Prinz is just way too sweet to be actually tasty and the chocolate will melt way too fast.

But they are still edible, especially for the infrequent traveller.

I find myself often refusing the "Snack" and just going for a drink but calling them inedible is an exaggeration. Nevertheless, I'd expect better from a decent airline.