For a while using kotlin as a simply better java "front end" syntax shim increased productivity. These days java has been "catching up", aka stealing the good

For a while using kotlin as a simply better java "front end" syntax shim increased productivity. These days java has been "catching up", aka stealing the good ideas from kotlin--so it's less appealing to me. I think where it still shines is in cross platform targeting like ios, android, desktop and server as few other languages really enable that. C# did, but only because of one vendor (Ximian or whatever it was called, some offshoot of Mono)