It is very useful when we need to edit materials. In this video, overall material is already good. Make it your routine to have material layer during rendering. It will help u when needed
a HORRIBLE overhyped piece of software, in the likes of Bryce, Lumion is good for exterior scenes and adding landscape and plants - it only allows you to use prefabs, you cannot build your own custom house, interior, you cannot build walls, floors, ceilings, nothing of that, it