While the GUI frontend part in GWT is indeed mostly abandoned by Google, they still use the Closure compiler (which is the evolution of GWT in a way) very heavily in all of their flagship web applications. That way, most of the business logic is written in Java on every platform (backend, frontend with the aforementioned compiler (which produces crazy good output), android, and ios with a similar objc compiler), and the frontend can be native everywhere, which is imo the best tradeoff.