It is a common misunderstanding that in order to derive any benefit for the user; a relying party must be aware of the selector based information card and fully support the selector based identity model.

This is not accurate. The identity selector can communicate with a relying party proxy and derive benefit to the user independently of the awareness of the specific relying party.

However, if the relying party is aware of the identity selector and its accompanying information cards, it can provide a richer experience to the visiting user based on the relationship of the user and the relying party.
Thus, there is a benefit ratio to the user or application based on the awareness of the relying party. This ratio is referred to as the Relying Party Awareness Spectrum.