Carbs are the basic molecules used in your energy metabolism (i.e. almost everything gets converted into glucose through one pathway or another).
If you'd try to meet your calorie requirements with a high protein intake you'd just put unnecessary strain on your kidneys and I don't think you'd enjoy your food as much (don't get me started on keto people)
Also I've already read the Scholomance series, and I get what you're saying, but I thought the premise with the school was kind of dark and the whole mawmouth situation was really fucked up ._.
Would you say the first Stormlight arc ended at a good spot? I'm eager to start the series but have been staying away because it's unfinished...
I can't say much about that, as I have still a couple of hundred pages left, but I would still recommend it as the first 4½ books have been an amazing read.
Also if you haven't read the Mistborn series, I would highly recommend it as well, since there's a bit of overlap between that and the later Stormlight books
(but also basically any other Sanderson novel lol)
That's just a PhD