Level Design tools not quite fast enough, for solo level designers.

Minecraft is a game though. You could make a Minecraft like game but if you are talking about voxels then thats another story.

Btw, Maya feels stranger than Zbrush to me, and so does Blender and any other modeling app because i use 3ds . It’s all about getting used to. And Epic is helping Blender out to make it more UE4 friendly.