Maybe its was requested yet , but i think that a very important aspect is to calculate polys, size or various stats of an experience(maybe when we build it).
A lot of people infact, starts to load an experience, and give up after several minutes, because has not a reference, a preloading bar or something else.
When i create a mesh, i know the number of polys, and work with low poly objects..ok!... But (for example) if i want to create a forest and use many and many trees and grass, would be useful to know the size or weight of the entire scene.
These kind of stats are very important, because the risk is to work for months to something, and maybe the experience results very hard to visit.
(sorry for my bad english!!)