Along those lines, it may be useful to recommend which of those
properties are useful and why. For example, should I have a contact
property? I think there should be a minimum to implement so there is
interoperability -- otherwise it is hit or miss if it will work. The one
bit of client_id_metadata_document_supported will unlikely not be enough to
have a successful flow unless there is a MTI.
From Dick's review on the email list: https://mailarchive.ietf.org/arch/msg/oauth/tgHv0MMU8PqyNjwsXIze3BUSn9s/