The reason this problem exists in SketchUp is the poorly implemented inference method. It is insists on inferring all kinds of points that I (and others) don’t want. If you could specify the type of inference (e.g. center point, or end point, or none) this problem could be eliminated. I frequently run into this with all kinds of situations including purely 3D design instances. But there are also instances where you want to put down lines or points in irregular positions on a plane (no matter what the orientation of the plane, you are now working in 2D) and it is a horrible pain in the … with SketchUp. Some instances where these forms are used in SketchUp include FaceMe objects, people, trees, etc. I often want to draw water bodies, streams, etc. with irregular outlines that will be fully 3D entities as my drawing progresses, but it’s extremely awkward to do with SketchUp. Having to go to another program like AutoCAD or Illustrator to create these lines and then export them as DXF and then import them to SketchUp is ridiculous, but necessary. SketchUp should fix this,
I admire you Gully. We disagree on this point.