It is.

The team that writes the code should also deploy the code and get paged in if there are problems in production.

That creates a tight feedback loop that requires developers to learn and manage the whole stack, code defensively, and test enough to be confident to deploy to production.

Didn't test your code enough? You will be paged in the middle of the night to fix it. It creates a strong incentive to make good decisions because you will be living in the mess you create.