No one is saying that designing a language is uncreative. The distinction is not between creative and non-creative. The question is between purely creative and

No one is saying that designing a language is uncreative. The distinction is not between creative and non-creative. The question is between purely creative and functional. Functional things are usually not covered by copyright while creative things are. Things which are both need to be considered more carefully. A computer language would never be copyrightable anyway because it is not a fixed expression. It's a set of rules for expressing things and that is never covered. And APIs have never been covered because they're purely functional, regardless of the level of creativity involved.