I think you are close, but I have to disagree with a point you make. You want SAs in the loop to **develop** the environments and tuning: we want infrastructure as code where sysadmins document their wisdom and make it reproducible everywhere (in dev, staging, test, etc.): not by hand in only in production. Otherwise, we end up with deltas between development and production, which is a gap that can cause trouble and problems to creep up only in production.
This is where we start to close the loop on infrastructure and software engineering by instrumenting our code with metrics, performing forensic analysis with logs, and tracking health/uptime/performance with monitors. Otherwise, yes - handing off production to the system administrators to do their dark magick is the old way and it is NOT the DevOps way.
DevOps allows us to approach the problem where tuning and troubleshooting on your laptop or in production should be, as much as possible, a shared exercise with shared tools.