Apologies if this has been requested before.
In the real world, very few things are hollow and nothing is hollow with a zero thickness wall. So it would be nice if SU were able to be more like the real world, so that if you section-cut something solid, a face is created at the cut face. I know there are plug-ins that will do this, but is there a reason it cannot be a native feature? If it mucks up something else, perhaps it could be an option when making a section cut?