I found the descriptions of sensitive data nodes in Security Considerations useful. I'm sure they'll be helpful to implementers. 

nit: In Security Considerations, "Therefore, many security risks such as malicious attack and rogue elements attempting to connect to various ACTN components." is incomplete.

nit: in Introduction, "Abstraction and Control of Traffic Engineered Networks (ACTN) describes a set of management and control functions used to operate one or more TE networks to construct Virtual Network (VN) that can be represented to customers and that are built from abstractions of the underlying TE networks [RFC8453]" reads awkwardly. Also "TE" is not defined before being used (it's defined in the reference).