One reason not to use Kotlin: its syntactic sugar makes it harder to read for someone who doesn't know the language. Most Java syntax and semantics are pretty

One reason not to use Kotlin: its syntactic sugar makes it harder to read for someone who doesn't know the language. Most Java syntax and semantics are pretty much self explanatory for anyone who has worked with any object oriented language before. (Java programs are often rather difficult to understand though, but that's due to overengineering, not the language itself.)