I am one of those who also think this is worth pinning but where? I think it's more suitable to put it in beginners & help section rather than in Bitcoin discussion as it also have some topics regarding the forum and not just bitcoin itself.
I agree that its suitable in beginners and help as it's an overview, new users will likely see it when they are getting started and learn of topics that interest them right from the start.
On the other hand I can see it fitting under the New to bitcoin start here topic on bitcoin discussion as a fourth sticky determining the location of topics of interest to Bitcoin users.
All in all this is in the purview of the admins to determine where and what section of the forums it most suitably should be placed under.