This makes logical sense, but from my testing it doesn’t seem to significantly improvement in bounce lighting for Lumen. The difference was very pronounced with Lightmass.
I’m not really sure why the effect is so subtle, perhaps the surface cache has a bounce limit? No idea…
Here’s the difference in Lightmass for comparison:
Currently, using realistic lighting values also has some other drawbacks. But I’m guessing those issues will be fixed.
I think right now the biggest issue with using low sunlight values is that it makes all your other lights unrealistically bright relative to the sun. Which is something you can’t easily fix when using low sunlight values. Think of a cars headlights during the day, people routinely forget to turn their headlights off because in direct sunlight you can barely even tell they’re on. But if you reduce the intensity of the sun then they become relatively brighter.
That is not the impression I got from it. It seemed more like an exploration of the toolset by their artists, trying to showcase what’s possible. They emphasized that they were looking forward to learning from the community as we get our hands on the tools, so I wouldn’t interpret it as if it were a guide.