1. Every class/method/function/whatever declaration is an API, doesn't matter if it's internal or which language it's written. 2. Why do you think it's better? It looks like it tries to cater to everyone, and leads to inconsistent API usage and requires teams to agree on linting rules and use tools to enforce consistent coding standards. 3. It's a tool for _you_ to design good APIs that are clear. Languages without named arguments don't give you this tool.

> So does renaming a label.

In languages without this feature, any renaming breaks the API, unlike the ones with distinct internal and external names. This is not the same.