New Terrain, and Parts, and Built-In Materials, Oh my!

This is absolutely stunning! As I am looking forward to an eventual professional development hobby in the future (hopefully near), the much needed new materials (and their additional applications in due part being applicable to primitives) will be greatly appreciated not just by me, yet other obviously many other developers! I thank all the team(s) putting forth the effort to bring us these wonderful new features!

Now I would like to bring in the question of fidelity for terrain geometry and water (not completely relevant, however, I am curious to the future); will we see improved quality to the terrain geometry overall, as well as different ways to form terrain via tools such as high fidelity integrated rock formations using the geometry of the terrain? Further more, could water be on its own stand alone grid to rid the ugly triangular boundaries between that and terrain? Not only is that disruptive visually yet certainly physically, as the transition is by no means seamless.

Many thanks in advance!