That is the nature of current models. Don't pretend that it will always be this way.

Your argument is moot anyway, how exactly is adding numbers together proving that such a thing isn't derivative?

I add numbers together, because I got taught to in school, because my teachers got taught to, because humans learnt to a very long time ago, because they observed a collection of things of different numbers. Perhaps the first human to count enjoyed an original thought. Or any who did independently, communication is the origin of derivation. And us humans are alllll about communicating.

Adding numbers is not an original thought, not in this context.