Sure, the law of diminishing returns applies, just like it does with most things. I don't know Dustin, so I couldn't guess where he falls on the curve. What I can say with a degree of confidence is that most people position themselves too far on the other end of the curve.

Some context though: Dustin's article expresses that he enjoys the process of researching products that are well-designed. Therefore, I think it's reasonable to elongate the curve just for him and others like him.