> The only developers I know who write Java full time work in systems that take pictures of things from far away.

Huh??? Google, the search engine part, is written in Java as far as I know. Yandex uses Java extensively. Odnoklassniki, once second most popular Russian social network, is written in Java. Banks like Java. Android apps are written in Java (and Kotlin, which I consider an abstraction over Java).

And that's only what I can remember right away. A sizable chunk of the world runs on Java.