Roger that,I kept up to date with info up until A17.4. I played a little of A17.3 and thats when i decided to put down the game until A18. That was the first time i ever made that decision in all the years I've been playing. Yeah that b-line crap was crazy. I do remember when Faatal talked about changing the coding for A.I. so that would no longer happen. Anything stated A17.4 until now i've missed out. I'm catching up on all my info though its just taking a minute to go through all the posts, twitters accounts, and youtube vids by TFP. A18 is looking nice

This up coming version looks worth dropping another few thousand hours in again lol
Well it feels like most of them still bee-line in most situations, though I do remember some Faatal talk about introducing a percentage of "dumber" zombies into the mix. I lost track of how far that got with implementation though, and am very curious to see what things are like in A18.
They are only hard to deal with at first, for those who got used to A16 AI, which was a different challenge, especially on Blood Moons. But then, once you realize how "smart" they are, how well they path, they actually become much easier to deal with. You just exploit that, you can steer them, know where they will go, and lead them on all kinds of different paths, the most effective being a loop where they climb, fall, repeat. On BM they tend to carve a straight path to you through the spikes, but I have noticed more variation on recent BMs, like a few dif groups may try it from different directions, though that was during a BM with many other players, so it could have just been the dif directions each of our hordes came from, if that's a thing. Not sure, but overall they got some tweaking, and I imagine there'll be more to come.
On like my 3rd A17 game I had fun with the pathing, one of my fav ever base designs. I converted a house on the lake in Nav where I pathed them into my house, through my living room, upstairs onto the porch, then they fell, repeat. Most didn't even make it in the door, I did have a bit of a gauntled out front, jsut some barbed wire and a piece of e-fence, and if they did walk in the door a motion sensor turned on the blade trap. Very few ever made it up to the 2nd floor porch. I did this every Blood Moon, not just in between or with wandering hordes/screamers. I had to go out and pick off the vultures, and did still gun down and molotov, but I could also just chill inside, do other things, and pop off whatever random Z actually made it that far.