It's the sad psychological state of kiasu people. People who are able to look beyond marks will notice the superficial nature and treat it as such. Regarding the article: without seeing the camera or having any neutral assessment it's nothing but the complaining of a (likely) careless person. The structure of the marks is obvious and with so many copies of 5D3 sold we should see more issues coming up if this were a general problem.More user mark=perceived as more used and worn=lower resale value.
Two cameras, both equally used. The "prettier" looking one will fetch better resale. Hard truth.
I know I will not buy a camera in this state, even if it was still in perfect operating condition, unless it was cheap. 99% of the population will think likewise. Actually, I will not buy a used camera this worn, even if it is cheap.