There is a learning tax at the beginning, for sure, but this is a fixed cost. We experience that once this first hump is passed, the code and output quality is higher, and the cloud resource cost decreases significantly.

Now the challenge is to hire new developers that are not familiar with Rust; it would take a month or so for them to be productive (assuming robust internal code practice). But, well worthwhile in our opinion, as least for greenfield application/services.

(We are coming from Java / nodejs/TS)