Not really, its a good idea to keep all entities of your model grouped in case you need to edit them later. For example, you may decide to change that simple profile for a different one down the road - if its grouped just delete the group and draw the new one, if its not grouped, you have to delete every line of the old profile before drawing the new one.
Grouping also will make it easier to texture and organize your model, especially important as your models get more complex...