Simply because GNS, The Big Model, etc. were not taken as gospel truth. They are simply theories that can be discussed and challenged without prejudice.
Most other sites I perused (and lurked) seemd to lean towards assuming, if not completely assume, the truth of these theories. Debate seemed, in my admittedly limited experience (I've only been posting here for seven months), to protect the theory from challenge to keep it pure, as opposed to purifying the theory through challenge.
I like this place because virtually nothing is protected from challenge.