I don’t see the usefulness of instantiating an object that will do nothing under any circumstance.
I could be wrong, but I remember there being a shift after the 2nd plenary, where based on feedback from a bunch of people, that things would have “useful defaults”. This is more-or-less the case across all the objects. All the descriptors one do something reasonable, novelty slicing works be default, hpss/nmf, etc…
These two stand out as being different.