Never forget, every Unity demo we've seen has a ton of custom tools. For example, in "The Book of the Dead" they had all these custom tools, even some obscure AO tech for trees that didn’t work when I downloaded it. I remember complaining about it on their forums. Unlike Unreal, Unity’s never really “what you see is what you get”. Don’t get me wrong, I liked the short film, but Unity has always been like that, kind of "faking" the real capabilities of the engine. From an investor’s point of view, though, I guess it's good marketing.

Someone (@kratos_1335) in YouTube's comments.