My understanding of the primary trifecta of Stack Exchange websites was challenged by my question on Super User. I used to think that between Stack Overflow, Super User, and Server Fault you could get any computer related question answered. Stack Overflow containing answers for developers, Server Fault for server administrators, and Super User for end users.
Then I discovered that website based applications, despite being targeted at end-users does not qualify for Super User. If Super User is not meant to target End-Users then what exactly is the target for Super User?