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(1) Since this defines a behavior where one incoming packet can create N outgoing packets, I was surprised that there is nothing mentioned in the security considerations about how access to replication nodes and ingress for them should be protected in order to prevent abuse.

(2) The intended use seems mainly to be where some outer control system is responsible for making sure that the replication operation will put packets onto distinct network paths, and not create congestion either locally or on some potential shared network segment downstream.  It might be more clearly stated that it's assumed that building a proper multicast tree, managing group membership, and performing multicast congestion control need to be performed elsewhere.

(3) I didn't recognize the syntax or pseudocode conventions in section 2.2.1; maybe this is common or defined somewhere else that could be referenced to be clear?