Mountain scapes will enable you to:

  -  Create better looking environments through the use of premade terrains
  -  Use 3D terrain instead of a 2D backdrop
  -  Use micro displacecment to increase quality and save memory space

Why you shouldn't use 2D backdrops

Using 2D backdrops often is the common and easy way to get a quick background in. Just use a decent image, place it behind your scene and skip on the sculpting or texturing part.

Problem is: a 2D backdrop will never correctly match the lighting in your scene. 

Additionally, animating with an image backdrop will almost always look flat.

Rendering with 2D backdrop vs. rendering with mountain scapes

What you get:

-36 different 4k Terrain including a displacement and albedo map

Example terrain:

Future updates will include:

 - Desert

 - Arctic

 - Canyon terrain

 - Highlands