I like Kotlin and would probably use it but I just couldn't get over the lack of list / map literals. Seems like they never could figure out how to get them to mesh with the static typing. It's just too useful to be able to write nested structures cleanly and simply inline for ad hoc / exploratory analysis.
yes, they are fine at top level, but they fall apart when you try to nest them unfortunately (lists of maps of lists etc ... ). In groovy / javascript / python these just look completely natural.
