What Unity is doing is adding the feature for progressive lightmap rendering from the current camera view, or you can use it to render still images at a higher quality than what you normally get in the game (mainly for lighting and reflections).
But… I don’t see any development on that side. Do you? They had something called DFGI but it got abandoned afaik. Now we have nothing outside of vxgi but this is not made by Epic.
VXGI is closed source too and performs well only on Nvidia hardware, poorly on AMD cards. I hope EPIC will invent best GI solution that has great performance on all GPU-s
I think at the moment its not very realistic to expect a fully dynamic GI solution which works very good and fast in the next few years. I think the combination of Baked and Dynamic lighting is quite a clever method, but the tools and to work with this system in Unreal is quite unhandy. Thats why i think that some more next Gen ( ) tools should be implemented to make it easier and more fun to work with baked lighting in Unreal.