The amount of time required to build, texture, skin, weight, and animate a character in a contemporary video game is immense compared to the time required even five years ago. The same applies for levels.
If all a module-builder wants to do is scale and tint critters that are already built in the NWN2 toolset, great. But if someone wants to create new creature or prop/building models, it's going to be a lot more involved than it was in the first NWN.
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This is true but it's not as if it was easy to add thing to NWN anyway. Hundreds of parts just to change one little thing? I don't really care what's involved as long as there's decent support info I'll get stuff into the game...