On the other hand, there are some design principles that one might use to make more absolute judgements of “good” design.
I greatly appreciate how the text provides some design principles to refer to for critiques. As someone who just recently began their design journey, I often associated "critiques" with what "looked good." This POV is pretty misguided as it doesn't focus on usability or actual functionality (or the other principles mentioned) so I'm glad that I'll have a point of reference for future design critiques!