In the early WoT books the gang was all together and had a recognisable sub-goal to achieve. When they started to split up, and meet even more new characters, you ended up with about a sixteenth of a story about each of them in each book. I think it's a problem with any sprawling, continuous, multi-viewpoint series like that. Song of Ice & Fire arguably has the same issue right now. Anything much over a trilogy is probably unsustainable unless the books can stand on their own.
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