No, you don’t, if you remember to check in the Import Options that the import unit is set to the same unit that has been used in the DWG file. The default is, for some weird reason, Feet.
The DWG to SketchUp importer is severely limited in that it only imports “lines” and “faces”, meaning geometrical entities. Annotations, hatches etc. are ignored.
I really don’t understand what a DWG to LayOut importer ought to do. LayOut is like the Paper Space in AutoCad. How should the importer handle model space elements? Should it import only the content of paperspace layouts? Note that the model space in AutoCad is a fully 3D environment even if quite many users decide to draw everything “flat on the ground” and LayOut doesn’t have a third dimension independent of embedded SketchUp views.