Interesting point! Based on what you said, in a way caveman does save your human brain tokens. Grammar rules evolve in a particular environment to reduce ambiguities and I think we are all familiar enough with caveman for it to make sense to all of us as a common. For example, word order matters for semantics in modern english so "The dog bit the grandma" and "Dog bit grandma" mean the same. Coming from languages where cases matter for semantics (like German), word order alone does not resolve ambiguity. Articles exist in English due to its Germanic roots