In terms of the larger files, once we have them, we have them. The wait in terms of a longer update is worth it if it pays off for a cooler game world.
And when a 350MB file is updated and becomes a 375MB file, World Gate used to just update the parts of the larger file that made it larger rather than having to always download the entire huge thing again from scratch. I am not sure if the NWN2 auto-downloaded does this or not.
If you and the other builders have a vision, that is the world I want to see and move around in, regardless of the size.