Add text on why CT uses RFC8277 (Appendix) that includes scaling discussion. Sizing discussion should reference the following (at least): draft-hr-spring-intentaware-routing-using-color-00#section-6.3.2, and packing for SRv6 SIDs
This issue is closed with the publication of draft-ietf-idr-ct-12. A review of the text by Jeff Haas, Keyur Patel, and Jie Dong may cause this issue to be reopened.