I am the assigned IoT Directorate reviewer for this draft. The Directorate aims
to review IETF documents related with IoT (Internet of Things). Please treat
these comments just like any other last call comments. For more information,
please see https://datatracker.ietf.org/group/iotdir/about/

Summary:
I found the document easy to digest and in addition to establishing basis for IPv6 extension header related limitations it also serves as a good summary of other relevant extension header work.
After reading I was wondering why there is no recommendation of routing header related limits other than bunding it with e.g., the "limit on the maximum length of the IPv6 header chain up to an including the Routing Header"?