I got mixed feelings about this question.
This is to its end is a survival game. But past that stage, for those of us who play on MP servers, after we get past the hard part of placing our roots and building the foundations, we move on to aesthetics and experiment further with base defenses. We interact with other survivors, help the newcomers on a whim, or just scare them with strange noises outside their bases (hehehehe). So it's sort of like an ending itself, a rather happy one where you survive the zombie apocalypse and manage to eke out a stable happily ever after.
Keeping it simple and staying true to the 'formula' brings out the best enjoyment. I think of the movie Pacific Rim. The plot's terrible, the actors... well who cares really, maybe Idris Elba (great performance in Luther), but it delivers on the action, that niche for big robots and big kaiju battles! It fulfills its purpose fully instead of trying to do more than it's capable of and falling flat on its face.
Going off on a tangent, this ties in with the AI. I did not play A16, so I'm going by what I know in 15. The zombie behavior, was for the most part the 'popular' perception of zombies, simple. But it's true to its nature. One of the aspects which made it easier than intended was its interaction with certain blocks making them miss often or all the time depending on which. Otherwise it was a very sweet spot. Now it's a little more complex but still the same difficulty if you funnel/maze them aaaand it just doesn't feel as good.
I'd rather not over complicate what's already enjoyable.