It's amazing to see how far the language has come in such a short time, and your article does a fantastic job of highlighting the most useful features of Kotlin. The clear and concise writing style makes it easy to understand and appreciate the hard work and dedication of the Kotlin team. I particularly appreciate the seamless interoperability with Java, as well as the concise and expressive syntax. In addition to the features mentioned in your article, I'd also like to highlight some of Kotlin's other powerful features, such as its support for functional programming concepts like lambdas and higher-order functions, its concise yet powerful type inference. Great job on the article and keep up the great work with Kotlin!