I created a new project and I only see blockiness if I use a small brush when painting the landscape. From what I’ve read, blending only has one value per vertex. I was wrong earlier when I thought it had the same resolution as the visibility layer (though the two could be per vertex).
Here’s what I get with a small brush (size 100 to 200). Main layer is blue. Painted layer is red.
We can clearly see that it’s per vertex.
Here’s what it looks like with a brush of size 500.
Could you provide a screenshot with Lit Wireframe? An area where there is blockiness?
If you’re drawing per vertex, then you just need to use a bigger brush. I hear that using height blending also works a bit better in some cases. If you have a use case for that, you could do that for those layers.