Hmm....i would much prefer that if time was spent on refining how the support stringers can be modeled. Attention should be given to how it terminates, e.g. at the floor levels, or the transitions at mid-landings. The current tool only allows for a vertical or horizontal slice, and almost always, the stringer extends beyond the last riser, and is trimmed vertically. Impossible to model using the OOTB tools.
Regarding steel sections? It is actually really easy to create profile families using the same out-of-the-box type AISC type catalogs that the structural framing families utilize. Nothing fake about profiles using these tables.
Personally, I would have little need for this, but see no harm in providing it -- as long as the bigger issues of resolving the modeling difficulties are addressed first.