Earlier quoted context omitted.
My HOWTO: 1. Obtain laser tape, pencil, and paper. 2. Sketch out floor plan with pencil on paper in rough scale. 3. Take laser tape and take needed measurements. Annotate measurements on your rough scale paper drawing. 4. Go back to desk and open OmniGraffle (or Visio or whatever). 5. Draw up a scale floorplan, exportable into any needed, industry standard formats. 6. There is no step 6. Some variation of this HOWTO…
This app seems valuable to non-professionals who may want a digital floorplan of a room. Since you are a professional with 20 years of experience, you have an established workflow, and know how to deal with the variations. Experts will often be able to out-perform automated solutions, which is fine. Those automated solutions are for non-experts.
No data is better than bad data.