[forgotpwd16]

>What would be the reason for using "lsd" instead of popular IETF RFCs?

Maybe due to the following?

>This specification was developed outside the IETF and does not have IETF consensus.

[capableweb]

Most RFCs start without consensus as well, that's why they are Request For Comments, to reconcile about the idea/specification

[schanzen]

This sentence is usually added for specifications which are submitted independently to the Independent Stream Editor, as opposed to drafts which are discussed in a WG at IETF.