It's my opinion that it's mostly related to the quality of the site.  I can't tell you how many problems you can Google for and your first ten options for answers are on the stack network.  
  
**In my experience:**  
  
Specific Debian derived error messages mostly point here, in my experience.  
  
Really intelligent configuration Google queries tend to end up here or the arch-wiki.  
  
**Just a personal note:**  
  
The second subset of people that know it's a fork/derivative, should, probably, also understand without asking that there are very significant differences between an upstream distro and a forked distro.  They just seem to ask anyway...  Specifically when the entire GUI system is lopped off and replaced (like the Mint -> Ubuntu with Unity -> Debian with Gnome 3/KDE/some lightweight window manager).