Thanks, Vivian. I appreciate that. Yes, that will work if the recommendation is something like "this looks best on matte paper."
However, the product I want to roll out I would like to offer only as prints and canvases, removing framed prints, metal, etc. And a blurb in the description saying "do not order this as a metal print, acrylic, etc..." doesn't work.
Selecting products to offer and not to offer would obviously be powerful and useful to a seller. My guess is the reason it is not being considered is because it would be a major coding task.