We have rephrased the four paragraphs where the referee found that the described examples are not always easy to follow.
However, being experts in their field the authors might not be aware that for readers less familiar with the metabolism/physiology of archaea, the examples are not always easy to follow, such as examples given on p. 7 starting line 196 (The main difference here is between a ferredoxin-dependent and/or a NAD-dependent decarboxylation of pyruvate into acetyl-CoA?/A few lines later when I read that “halophilic archaea do not contain the coenzyme methanopterin”, I had to go back and reread the preceding sentences to get an idea of the argument. ), p. 10 starting Line 299, and p. 12 starting Line 354.