That’s Unigine Engine, made by a Russian company who is heavily into all kind of simulators. Thus, they have to have support for massive worlds and photorealistic real-time lighting. Those kind of projects pay their bills and so that’s where their dev focus is. If you want to make a game with that engine, well, good luck with that (I had a license for v1).
While I am in no way oppose fast and good looking real-time lighting (GI in particular), UE4 is a cross platform engine made for games/entertainment first and foremost, and I don’t think consoles can pull real time lighting efficiently. I’d rather have more features added to forward rendering and have high-performance dynamic shadows than real-time GI.