@giovanniv In that particular file, yes, it is exported as a faceted brep. If it were modeled in another way, perhaps a revolved solid, then it might retain its curved nature.
@Hans_Lammerts actually yes, quality of geometry is determined by MVD. That was in part why I raised this question in the thread below, as I disagree with the notion of an ISO MVD requiring a particular representation type. FreeCAD also seems to disagree with this notion, hence their ability to allow the user to define whatever they want.
@jwouellette it would seem that the post linked in @giovanniv 's first post cannot be accessed. Is there a private part of this forum that is hidden to public users?