Hi Ali,
Thank you so much for the answers! Great to hear you will be able to assign materials to each layer. For reference, I would recommend you check out this showcase of LAM so you can see how it works - https://www.youtube.com/watch?v=wkypCxc2Mzg.
Basically, you assign a master material to the landscape. This material has 5-6 layers that include grass, sand, mountain side, rocks, etc. And as you sculpt the terrain, the material updates in real time (blending and painting the landscape). The biggest benefit of LAM for folks like me is that the blending of layers is seamless and the materials all work well together.
However, the two biggest downsides of LAM are:
-Its very heavy on performance - many people complain that they cant really use LAM “out of the box” with anything outside of very highend cards.
-Since its realtime, the material compiles every time you make a change - The constant shader compilation can be disruptive as you cant do quick landscaping
If I were to have my wishlist, I would imagine the workflow to be something like this:
- Create base landscape with your node interface (heightmap or voxel)
- Do manual edits to the landscape (for me this is a necessary step 90% of the time to make landscape game-ready)
- Once I’m done with an initial edit - I press a button or run a function that “re-textures” the map based on slope, height, etc and populates the terrain with the foliage
This would be ideal because you don’t have the constant compiling of shaders (since its not “realtime” like LAM), yet it keeps almost all the benefits since you can just press a button to have the whole map compile at any time.
If you could somehow make your material run well on mid-range cards, then I truly believe you would have the best landscape solution for Indies and Hobbyist out there 
Another project that might be worth checking out is this - https://www.artstation.com/artwork/QoA48. I really think LA could benefit from a road tool similar to the one in this project. I especially like how the road adjusts to changes in the terrain (if you lower the terrain, the road becomes a bridge, etc).
Sorry if I’m making too many suggestions, but I want to make sure LA is the best landscape plugin it can be - its going to be my preferred solution afterall