While it's a reasonable concern, I don't think there's so much overhead in learning Kotlin. It's fully interoperable with Java, so you don't need to invest in l

While it's a reasonable concern, I don't think there's so much overhead in learning Kotlin. It's fully interoperable with Java, so you don't need to invest in learning new APIs (which is the difficult part usually). Other than that, it's really light-weight and easy to pick up, you can learn it in a matter of days. Most of its features are bits and pieces, or "the good parts", from other programming languages, quite familiar for any developer who's been around the block.