Thanks for the article.
Regarding Groovy’s persistent anemia of claimed (or real) adoption, I’m frequently baffled, though maybe less now than prior to 2015.
Groovy has been “ahead of the curve” in terms of providing an expressive JVM language with simple syntax and near-seamless Java interop. However, Pivotal dropping sponsorship and the current lack of Java 8 Lambda support may leave enterprises “wanting for proof”–i.e. that Groovy will be able to co-evolve with Sun’s Java/JVM development roadmap.