This is a great paper to aim at such a direction.
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.