I agree on the "knowledge stability" front. I feel like I have to relearn Linux server networking config every three years because I switched distro or a distro switched their network management middleware.

But.

Having tried to move a machine from rhel 5 to rhel 7, where 12 people had used the server over the past 8 years for any scripting/log analysis/automation, for hosting a bespoke python web request site and a team-specific dokuwiki... The idea of having all that in source control and CICD is alluring.