We don"t see a lot of things in the video , and the camera is too far and don't ove to show the normal and specular effects,
a little useless ?
What make me sad , is that other engines propose complete lightening and shaders integration, and some propose Deferred shading alreay laugh
Not only Unity 3D , some low cost engines like LeadWerks engine propose also that deferred shading.

So 3DGS makes me a bit sad in that areas.
That's like lightmaps import on models that is a hell on workflow compared to some other engines.

Well , i stop , i don't want to make people sad laugh