I need to spill my guts out!

This is nice of you to approve a 0+0 is anything other than 0.
But you know sometimes people forget to do the standard 0+0 math and they suffer a delay that’s based on literally no change.
The cracks of lava landscape you was experiencing were caused by Adaptive Tessellation being broken in UE4. I fixed it months ago by simply taking tessellation out. This time the crack mentioned above is actually the gap between the landscape and the background meshes. There is a gap between landscape and background elements in every AAA game that’s uses this workflow.

I am considering to upload everything to Gumroad with a steady 25% OFF sale to compensate the loss I’m facing .

Edit: To clarify further, Insisting on connecting a 0 to Metallic node is the same as insisting on connecting a 0.5 to specular where by default it’s 0.5 if left disconnected.