Okay, but what I'm talking about is that background features that give reliable access to (and outcomes from) NPCs are as much a part of the character sheet as the character's ability scores, equipment list, and (if the character is a spellcaster) spell list. Of course the DM can rule that your spell doesn't work for circumstantial reasons, but that doesn't mean that the ability to cast that spell isn't part of your character's identity, and that the DM isn't overriding the character sheet to some extent by doing so.I think they would inform but not constrain the DM's narration of the outcome of the adventurers' outcome. This may seem like splitting hairs, but we have to take any rule into the context of the idea that the rules serve the DM, not the other way around. In this case, it may well be likely that the DM always says the character can (for example) get an audience with a noble or help from his or her temple; however, in the realm of infinite fictional possibilities, that might not always be the case and the DM decides the result, not the rules and not the player, even if the rules inform the DM's decision. Thus, I would say background features such as the ones you quoted fall short of demonstrating that some NPCs are "extensions of the PC." In a practical sense, it might look and operate that way if it always works, but it's not an exception to the standard adjudication process.