That's true. With mental ray or vray, there is no need for lightmaps or uvmapping a seperate uvsets for that. For a lot of reasons, using these offline renderers are way easier but they take longer to render.
It looks like you haven't learned the basic workflow. This should help http://cgi.tutsplus.com/series/an-introduction-to-uvmapping-in-3d-studio-max--cg-30940