I don't think we have conclusive evidence, but everything that I see from myself it makes sense to categorize like that. It is either a quick intuitive guess or feel or alternatively I have to hash it out. It just fits perfectly to me.

I do think they are systems in a sense that one is optimsed to be a quick system and the other one requires time, but can solve tougher problems, create something new.

It seems fundamental to me that it is how things would get organized.