Mesaana used TAR to much more powerful effect than we've seen any of the FS use thus far. It goes a long way to validate the WO Dreamwalkers claims that they are as powerful there as the Shadow souled.

On the other hand we can retro fit some of Moghedien and Lanfear's earlier behavior. It's quite possible that Moghedien could only spy on the other FS because she willed them unable to see her ... her natural posture is to behave as a spy and creep about so seeing her hide behind a pillar isn't too out of character (for an admitted retro fit).

It's also telling that Moghedien refers to things in TAR as "bindings", almost as though in the AOL they approached TAR in a similar way to the OP. Makes me think the WO and their centuries of training traditions haven't outstripped the AOL Dreamwalkers in much the same way as the WF outstrip the weather workers of the AOL.