What do the official forums and the fan forums want?

I'm not a tournament player, but I want to share my opinion. I think most players start the game on "The Succession Wars" (SoD), and they come to the site with that experience. It's easier to start tournaments on a familiar game rather than immediately learning a new one – this might even discourage some potential participants.
I have "The Shadow of Death" (TE) and "Horn of the Abyss" (HA), but I don't use them. Instead, I often use "Armageddon's Blade" (AB) – I guess it's nostalgia.