I don’t think it’s that ridiculous (the next obvious goalpost being producing your own silicon), but since microservices means your DB is purely for your service, it stands to reason that you should also then know how to configure, backup, maintain, and tune the DB.

This is of course a wildly unrealistic ask, which is why I think the idea of merging jobs to save money is stupid. Let people who like frontend do frontend. Let people who like DBs do DBs. Let people who tolerate YAML do DevOps.