I just started messing with the VXGI UE4 build and i have to say it’s very promising, the results are better than pre-baked lightmass and better that what i have seen in CryEngine.
I don’t think it will be a viable real-world solution until DX12 is commonplace but - I do agree that UE4 should have had it’s own native real-time GI implemented by now especially since it was demonstrated with real-time GI before the engine was released and it was a let down when it was released without it.