Of course there's a subjective component. Design choices are intrinsically subjective but also perfectly valid. Subjective doesn't merely mean that all choices

Of course there's a subjective component. Design choices are intrinsically subjective but also perfectly valid. Subjective doesn't merely mean that all choices are equally valid and it really doesn't matter which one you choose. "Subjective" in this context means that you can't mecahnically use simple measurements, properties or heuristics to analyze correctness. That's perfectly fine. It's what designers are trained for and paid to do.