Spot on - in fact over time what we're seeing happen is the authors of the OpenID Connect standards submitting the parts as RFCs to the IETF. The OpenID Foundation is able to move a lot faster than the RFC process whilst coming with similar benefits of protection against patents etc. Obviously there's always speed vs quality tradeoffs, but given the number of interoperable OpenID implementations and the adoption into various openbanking systems (e.g. the UK OpenBanking standards) then it seems like (with the benefit of hindsight) the OpenID Foundation made some good choices.
From example, the request object in OpenID Connect (that can prevent authorization request parameters from tampering) is only just now coming out as an RFC https://tools.ietf.org/html/draft-ietf-oauth-jwsreq-19