I've been using the new prefab workflow for level chunks and it has mostly been working. One thing that's a headache is how slow updates can be. If you have a prefab that is used in many other prefabs even on a high spec machine (current gen intel cpu, 32gb ram, fast ssd, etc) the updates can be pretty slow. This can be particularly aggravating if you need to update a couple values on a prefab. Say you want to change the scale manually. You type in the X hit tab (wait for update), type in the Y hit tab (wait for update), and then type in the Z (wait for update). If updates can't be quicker if they could at least batch up updates and only update when no changes have come in X time that'd be a huge improvement. In the previous case if I could at least type in all my scale values and then wait I wouldn't mind so much.