Within the criteria of robustness, robustness can be measured objectively.
You have different criteria than robustness - understood, grip is important to you. Grip has its own objective measurements.
Christ.
You have different criteria than robustness - understood, grip is important to you. Grip has its own objective measurements.
Christ.
No, it isn't objectively. You are subjectively choosing the criteria that makes one purportedly better than the other, yet they have zero applicability to the use or operation of a smartphone.
Grip matters very much with a smartphone. Rubber breaking down? Has anyone ever actually seen this happen? Is this actually a problem? Torn or stained? Again, is this actually a problem in the context of a smartphone? I would say no, it isn't at all.
A soft, comfortable, lightweight device that you don't have to immediately shroud in a protective case is, by actual use-based criteria, arguably the better "build quality". Build quality is suitability to purpose, not aesthetics or cult of material.