I think there is some value in "someone who has spent billable hours deeply touching the currently running system is still employed at the company." You can hav

I think there is some value in "someone who has spent billable hours deeply touching the currently running system is still employed at the company." You can have maintenance updates & docs as numerous as you want, but I'd still be terrified of running a production system I don't have trusted nuts-and-bolts expertise in-house for.