Well, I can understand that mmd itself is small. But it seems to me that on top of this there should be various plugins, sets of clothes, textures... And I would like to find a build where all this is already installed. For example, Koikatsu is 15 gb, but with all the plugins and sets the size increases to 80 gb.Pretty sure it is MMD.
I get what you're saying, but MMD's a great program. Size doesn't mean much. Blender's tiny as well.