Nissa has the gist of it here - the NWNCQ overrides from Chico is NOT really for builders. It is for Players.
It is something that I have attempted to talk to you all for awhile now - as builders, obviously you see things and know things that players do not. You can routinely manipulate 2das and solve hak conflicts, yadda yadda yadda without real effort.
Players mostly cannot.
Thus, providing them with an easy to use graphical improvement (over the basic Bioware standards) is something that most Players go gaga for. The PRC realized this when creating the PRC and included the injector as well as the Java Character Creator (modified, of course, from the original CODI Character Creator of yore
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Most Builders (IMHO) create for other builders. They automatically assume that certain abilities and understandings are already present. And although there are graphical improvements included as overrides that are better than NWNCQ for specific environments, they often conflict with other equally good ones for other environments, etc.
Take many of the best tilesets, for example. They look great! They wow, ooh, and ahh the audience. But most Players cannot really use them. They have no idea how to open up a Mod, recreate a place with a new tileset, delete or rename the old one, and then tie up any "loose ends" like 2da incompatibilities or hak conflicts in order to enjoy the "new look".
When I think about all the modifications I use for NWN, and just how much work I have to put into making it happen, it boggles the mind. I once had to re-install NWN due to a HDD crash. It took literally weeks to get it back to where it was before! D/Ling all the changes that I have to have now, then putting them together to get them to work...it is a nightmare, really. If it was not for the override version of the ingame appearance changer, OMBs OHS system (really easy to "drop in" as an override), etc, I am not really sure if I would have the enthusiasm to re-install everything again, should my HDD crash in the future (which it will, eventually). Chico's system is just easy to use - it is not the "best graphical" improvement out there. Since something is easy to use, it spreads fast among Players (Hey, have you tried X yet? It really improves the game! Take a look at this!).
If there was a thing like a Community Override Project or somesuch, that took the best content (graphically speaking) and modified things without any work, I rather suspect that the NWN Community (Playerwise) would go bonkers with it. Include the new, cool characterizations, VFXs, etc, and perhaps an injector (for obviously I doubt that merely an override will work here) that basically solves things for Players, and one will soon see the best graphical content everywhere.
Much like the DA compiler - it takes packages that improve the game, graphically, and makes them compatible with one another, for the most part.
I know that Brian Chung was working on something like this for NWN - some sort of "ultimate 2das" or somesuch. I wonder whatever became of that project?