Larger bases with a footprint of at least 20 blocks per side (assuming a square base) do result in AI behavior more akin to the past. You will get zombies attacking your base walls at various points as the pathway all the way around to the other side of the base to get to that weakest spot ends up being longer than the pathing accounts for.
It is only smaller 7x7 bases (for example) where all zombies can detect that weakest spot from everywhere around your base and so they all go there. Take over the ground floor of a large existing building and try to defend it from inside during your next horde night and you will see the zombies trying to break through from multiple points.