We have seen and argued and debated this subject or one of its variants ("Developers spent X amount of time on wasted effort Y, when they should be focusing on Z"), regarding various parts of various games, ever since the internet forum debuted.
Somebody's personal preference will always be short-sheeted in favor of something else. And typically we make, read, and debate this situation while the game is in development; that's natural. We see what we see in beta, gameplay video, etc. and then we must base opinions off of that.
On the one hand we must bear in mind that the release gameplay will not be what we see in beta. On the other, we must bear in mind that Beta gameplay gives some kind of fair snapshot of final gameplay.
In the case of KC:D, we see some ambitious NPC routines. So the question 'is it too ambitious' is legitimate. At the same time we know the game is not finalized yet. We read and talk about the KC:D team scrapping things that they love and want, but which do not work. A quick look at the things we know for sure verifies this.
To me, this gives me no clear feeling that something like NPC routines in KC:D are wasted efforts, wrong or broken, etc, in the final game. Now, maybe they will be, but I do not see how the concern it is true, based on the facts we have, will make it a fact for the final game version on release day. "It has happened in this other title or that other title" is not valid in my estimation. And if it does turn out to be true, the Nostradamus-like prediction is simply happenstance, much like the "Told you Canadiens wouldn't win the Cup this season" predictions we may read. Yes, absolutely. Just like I am not in that teams' front office, we are not in the development team for this game. I am guessing based on my non-insider knowledge. Sometimes that knoweldge can be quite good, but still it is not a sure thing. World-weary negative predictions are as empty as sickeningly hopeful ones.
To summarize, concern is legitimate but none of us know for sure. We seem to have a development team that is putting forth an honest effort. I reserve punishment for when failure occurs, not when failure is feared. Yes we are talking money as well. In the real world, we gamble spending money on entertainment. We defend ourselves from spending money un-wisely by doing our homework before we spend, with all purchases.