One great boon is to use Kotlin code to factor deployment descriptors into reusable parts that are somewhat statically type checked. I wasn't responsible for the migration from legacy system to Kubernetes, but that seemed to me a big win. Aside from being able to update the whole, and only parts of the system so trivially.

For me the scariest part would be that it's not tech I would use (i.e. update the descriptors) regularly, so what if something goes wrong, how quick would I be able to identify the problem. I have no answer to that because I'm off the project.