I agree with the concern regarding leaky abstractions, but ultimately the developers should still own their services and be on-call for it, e.g. - On-call dev

I agree with the concern regarding leaky abstractions, but ultimately the developers should still own their services and be on-call for it, e.g. - On-call dev deploys a buggy change that messes up some transactional data. Product owner passes the complaints received by customer service. On-call dev rolls back the deployment, writes a script to fix the bad data, and then prepares a post-mortem. - On-call dev and on-call dba are paged because the database for the service is slow. On-call dev checks the service metrics and logs, and confirms that this is not caused by a deployment nor abnormal traffic. On-call dba checks the database metrics and logs, and finds some runaway queries due to silly optimizer. On-call dba kills the runaway queries, and proposes to add an index hint. On-call dev agrees, works on it, and asks on-call dba to review the change. - On-call sec is notified because of a new rce vulnerability. On-call sec comes up with the steps to identify and remedy the issue. All on-call devs are notified to follow the steps, to ensure that their services are not impacted.