this is a really nice videos to show your colleagues when you're advocating a switch from Java to Kotlin serverside within your company.
I also like that they came to the conclusion that the only useful productivity metric is developer happiness 🤩
actually the twitter post got it a bit wrong. Kotlin isn't THE primary language, but A primary language (as you can see in the original talk description). It's one amoung a few. I'm sure Java is still a primary language as well. Still, it's a good addition 🙂