The point is that you don’t really need a Gnome Git account to submit a patch. For example, here is a small bug.
This is Gnome 3.7 but that bug also affects 3.6. If Dash is empty you cannot add a new App by drag and drop. And even if you can’t write a patch to fix this, you can easily submit such annoyances in bugzilla. You can read more in https://live.gnome.org/BugzillaHelp