Thanks Nicolas,
I too have been hoping this WG addresses the core issues for several years now. Indeed, I will upgrade my statement in this thread from saying defining how the enforcement function should behave would be beneficial, to being fundamental. We need you, and others that agree, to speak up in the WG as, when needed, it seems support for these concepts isn't always present on the list and meetings. The API is a nice to have, but trying to solve network layer issues at an application layer (with no network feedback) is inherently going to problematic. It provides a bigger path for networks to be misconfigured, misinformed, and not fully integrated, than it does in solving the core issues at hand.
Cheers,
David