Well, if there were no royalties attached, then perhaps it would be legit to say that (and even then it would sound like “I am lazy and don’t care, do it yourself”). But that’s not the case.
Me asking IBM: “Could you please offer UE4 plugin for Watson?”
IBM: “And who are you, again?”
Epic (TimS preferably) asking IBM: …
IBM: “Oh hey Tim! Sure thing, we’ll put it on the roadmap”
Do you see my point?
This is from the same category as real-time GI… Epic doesn’t care for it, so it won’t happen. And now that Fortnite is a big thing, I’d say don’t expect UE4 getting anything out of ordinary. This is just proves the point that Unity makes engine for everyone, while Epic makes UE4 for Epic and $$$$$ paying partners, but dresses it up (used to, not anymore though) as UE4 for everyone.
P.S. I use UE4 and not planning on switching to Unity any time soon, but this is my feedback, so deal with it and stop defending Epic where it doesn’t need to be defended.