Yeah, there are lots of measureable physical qualities at play here: stiffness, elasticity, surface hardness, abrasion resistance. Like you say, we have an intuitive sense of how these qualities should be distributed in a material and that some of them should be linked and other exclusive each other. But some materials are strange. The article you linked notes that zyex also has a high melting point. Polyester and nylon strings notch partly because they melt at the intersections from all the string movement: zyex monofilament should be less susceptible to this.