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I don't think it is about bringing detail design forward earlier in the design process, but rather it is about exposing potential issues earlier in the process. Also the building model should be a development process in itself, not just a build it once and tinker process.

The issue (I think) is that the CAD vendors would like you to believe that to be BIM it has to be Revit, or Archicad or whatever. In reality it is as relevant to the BIM process if you start on paper, progress to SketchUp, work up some thoughts in a CAD system, then progress to develop one or more models which can grow as the project develops.

The key factor here is working in a 3D process and not 2D lines and curves. But that does not preclude the designer from extracting 2D details from the 3D model and breaking the link from it to work as they do already. Provided there is still a link from the 2D work back to the model (perhaps in a project management database system) this is still "BIM".

The problem is there is a lot of FUD (Fear, Uncertainty, Doubt) about BIM workflows. There doesn't need to be. Look to other industries to see the benefits a 3D workflow brings.