I am an industrial designer and use SU to create systems products for a large furniture company. We work on things that as an assembly can be of architectural scale but are made of things that are very fine scaled. Often I create models of aluminum extrusions that have very fine details, small radii in particular.
I often import DXF files from my engineers from ProE which is always a 2D model with excellent line continuity. I generally import them at a large size, if the model is in mm, I will set the import units at yards or similar to have all of the detail import properly and not suffer the loss of lines on arcs etc. I will then use “add faces” to create the faces and then resize the resulting faced, 2D element to the size it actually should be.
The bug I often run into is that when I save the file, that SU will unceremoniously delete the now very small line segments which make up the outline and I lose the surface of the object.
The same happens if I copy and then paste the faced object into another SU model.
If however I Push/Pull the face, it will keep all of the faces. Usually.
It would be nice if it would keep the data integrity despite the small size.