People using Gnome/Unity usually post their questions without bothering to mention this fact. Also, most users assume that when talking about folders or file browser we should assume they are talking about Nautilus.
Many questions/answers happen without ever the DE or the file browser being mentioned, although these questions/answers are in fact Gnome/Unity/Nautilus-specific. They give an impression of generality that do not in fact posses, and may become misleading.
Adding this request for users would greatly improve the clarity and usefulness of the website.