There's no chip on his shoulder, all of those things listed are stuff that UE supports out of the box. There's also a ton of things not mentioned like the cinem

There's no chip on his shoulder, all of those things listed are stuff that UE supports out of the box. There's also a ton of things not mentioned like the cinematic editor, scripting system, cooking process, etc. Honestly even if Facebook could, I'm not sure I want them to. I've got enough privacy concerns around what they do on the web. The last thing I need is to have a game engine that's used to mine every piece of data then can from me. When you have a non-games company controlling a platform their concerns are going to be above what's best for the content creators(see also: publishers).