While RFC9199 (are we really in the 9000's?) is targeted at large-scale DNS deployments--specifically root zone operators--so it might seem the average operator won't find a lot of value here.

This is, however, far from the truth. Every lesson we've learned in deploying large-scale DNS root servers applies to any other large-scale user-facing service. Internally deployed DNS recursive servers are an obvious instance, but the lessons here might well apply to a scheduling, banking, or any other multi-user application accessed from a lot of places by a lot of different users. There are some unique points in DNS, such as the relatively slower pace of database synchronization across nodes, but the network-side lessons can still be useful for a lot of applications.

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