The same could be said about Java or any other statically typed programming language in a text editor for that matter. Neither Vim nor Nano are intended as stan

The same could be said about Java or any other statically typed programming language in a text editor for that matter. Neither Vim nor Nano are intended as standalone IDEs, so it makes sense the UI is less complete. Despite their rudimentary features, many developers still prefer text editors for their low latency and wide availability across most shell environments. This is no different in Kotlin. If you want richer features like completion, refactoring and static analysis, use an IDE.