E.g. the response to your argument in this email:
1.a.i) Out of scope: Argue the point of header insertion or alternatives
in the context of those proposals, not in the context of the core IPv6
specification. Do not try to make a preemptive strike in the core
specification.
Quoting from this draft (Section 4):
"With one exception, extension headers are not processed by any node
"along a packet's delivery path
"The exception referred to in the preceding paragraph is the Hop-by-
"Hop Options header
I guess somebody has to come up with a creative interpretation of this
text that allows segment routing headers to be removed along the way.