Do you understand the concept of abstract syntax trees? This already exists in every language and we specifically and deliberately moved away from it because it's not conducive to code.
I think this library is more about a shared common AST representation in order to share some tooling around it and fast prototyping for DSLs. After I read the FAQ I agree with your sentiment, in the way it is documented and worded it sounds quite arrogant to be someone who just discovered the wheel.