New concepts require new words. They also relate to each other in interesting ways, which have names, too.
Alternatively, if I ever wanted to assert something more complicated than the weather I’d need to re-build the entire conceptual framework from scratch using small words and pictures.










Sometimes we use technical jargon to say something that we later realize is fairly simple. It might be obvious in retrospect, but still require thousands of years to understand, during which time the technical language is essential.
Anyway, other times we just need new words for new concepts. You can’t contemplate what you cannot name. Even the smartest humans are stupid by default and ordinary language is outstripped by our intellectual ambitions.