Some news.
The basics of an entity activity throttling system have been added to A21 to allow servers to handle more zombies. Large AI counts would overload pathing causing all zombies to be delayed in moving, so this decreases the update rate based on distance from players while still allowing each player to always have some fully active zombies. With this change, max zombie counts for blood moons and sleeper volumes are allowed to be scaled around double what the the cap is set to. The system also disables jiggle components for clients with distance as these were getting expensive as more zombies have them. The system will continue to be improved to throttle other activities.
I noticed last week we had an old Terrain Tool that was not being used, as it did not work very well, so it has gotten some changes and bug fixes. It now grows terrain in all directions (was just upwards before) and you can select the fill block. Undo also works. This will allow POI designers to make easier and faster terrain instead of the old add/paste/cut blocks and modify density using the cursor keys. Other improvements are planned.
Grass like plants now have shadows, which were removed years ago for performance reasons. Based on tests enabling shadows for grass near the player, I saw no reason we can't have these shadows and it looks nicer. Enabling and distance is controlled by shadow and grass quality settings.
We are also finishing the process of doing one more Unity update to 2021.3.19.
Since Faatal shared about the recent terrain tool improvements, here is a small sample of some terrain sculpting I did quickly with it in the prefab editor. Sculpting something like this previously would take me much longer. 
