So the main concern here is that we don't own the wikia pages. It's written by fans and it wouldn't be right to copy and paste their hard work here without their permission.
Wiki topics at the moment can only be made by Trust Level 4, mods and admins. They can also convert any topic into a wiki post. In the linked topic that's exactly what happened. There haven't been enough topics to give a reason to give them their own section, at the moment. We're open to making topics into wiki posts and will do so when we see them.
If people see something is missing they're more than allowed, it's welcomed, to create a topic about it. If it's deemed wiki or sticky (in that category and can be unpinned locally by each user) it will be made such. We don't want it to feel as if only mods. admins and gms (trust level 4) can create these things but rather have it open for anyone.