I don't see why AGs can't do both, intoducing the occasional long piece. A long indepth article every now and then would be interesting, and they'd probably stimulate more good discussions in the forums than some of the shorter pieces are able too.
Basically I don't think short and long are mutually exclusive.
P.S. Even so, I think the ags are great as they are and enjoy visiting the site as a hardcore adventuregamer.
