To open a 2d drawing in pure autocad, whe need to explode details with a defined procedure:
https://knowledge.autodesk.com/support/advance-steel/troubleshooting/caas/sfdcarticles/sfdcarticles/...
Problem is, the dimensions are all exploded! I always need to do some fine tunning on the 2d dwg using autocad and my clients uses only pure autocad. Send the drawings with exploded dimensions are an serious issue to my clients...
Please, do like Revit! Export to dwg but do not explode dimensions!