I've been writing quite a bit of Kotlin, lack of semicolon isn't a great idea in my opinion.

The problem is that while Java is newline-agnostic (newline is just another whitespace), Kotlin has some rather difficult rules to determine the what a newline does.

Granted, the rules are not quite as insane as those of Javascript, but I find it very unsatisfying newlines are sometimes significant, and sometimes not.

And just to make it clear where I'm coming from on this topic, my preferred language is Common Lisp, so I really prefer consistent syntax.