Bedrockgames
I post in the voice of Christopher Walken
Yeah, I've had situations where the GM decided one thing and literally everyone else at the table disagreed. How we handled that in the past has varied over the years, but there's been a steady progression toward discussing with everyone and deciding as a group.
The only thing I'd say is that GM having final say is fine, but for me, that's more about when it's otherwise a "tie". Like I want everyone's ideas about the game to be considered equally.
I think my view on this is I just find the games works most efficiently for me when we all agree one person ultimately has the final call on these things. And so when something like this comes up, generally with the kinds of people I play with, we are happy to raise our concerns if there is an issue, but we also have no problem letting the person we've all agreed is the GM make the final call and move on. If someone is particularly bad at doing this, we probably wouldn't keep them GMing too long or someone would talk to them if their judgments are becoming an issue. Hasn't really been much of a problem for most of my groups (these kinds of issues are something I've mostly not had since high school I would say. So for me, it doesn't need to be a democracy. But I also wouldn't want a GM who just told people to shut up if they had a serious issue with a ruling. In general, I'd say a single player holding up the game (whether that player is the GM or one of the players) over something like this, would be more of a problem for us than a bad ruling (i.e. we don't like getting bogged down in disputes over rulings or rules, and just want to move things forward).
I don't think the nobles need to know each other, or even of each other, for the ability to make sense. It's not contingent upon recognizing the specific person. And while I would agree with you that I wouldn't expect every GM to rule the same way, I would say my expectation is that the ability should work unless there's compelling reasons it shouldn't just as if I cast a spell and the GM decided that the typical results of the spell didn't happen. Can there be reasons? Sure, of course.... but in my opinion, those better be better than the GM saying "I don't like that idea".
Sure, I'm not giving my personal ruling on that ablity. I'm just saying I can see how it would lead to different feelings on what should be the case, and I would generally be okay as a player with a GM saying to me "this ability doesn't work because of X reason having to do with the setting" if that reason seemed sound. Aain I wouldn't have to agree with the reason, but if the reason makes sense, its fine, and even if the reason doesn't, I'm generally okay with the GM making that call because that is my understanding going into a game. So if I am with a new group and a new GM and the GM makes a ruling on it I find kind of odd, I'm just going to roll with it and figure that's how this person thinks about these things, that's how this group handles it. If over time, I wasn't gelling with the group, I'd just find another one. But overall I vastly prefer having the GM be able to keep things moving along and maintain fidelity to the setting (over what any rules might say) because 1) I've always been a flavor first kind of player----this was something that irked me about 3E even though I quite liked that edition and 2) What annoys me most in games as a player isn't odd calls, being ruled against, or questionable application of rules but the game bogging down in debates, conversations around rules. Again experiences will vary here, but with the groups I play with, we are all kind of one the same page in terms of being okay with that. Plus most of us get to take our turn in the GM seat at some point anyways so you are always seeing differences in how people rule on this stuff (and my reaction tends towards curiosity over ruling differences than towards disagreement).
That said "I don't like that idea" isn't particularly compelling for a reason. I'd hope there is more to it than that if the GM blocks an ability. But "I don't like that idea" can just be another way of the GM saying "it feels off somehow" and not being able to put their finger on it. And I do generally expect an ability is going to work unless there is a reason for it not to. I'm just also not going to get hung up on it not having worked. Maybe if half the time a GM was making rulings I strongly disagreed with, I'd feel different, but I find with my groups, I hardly ever find a ruling unsound or not having reason. When it occasionally happens, it isn't really a problem for me (I don't expect the GM to make perfect rulings every time). And my approach as a GM when I feel I have made a bad ruling or when someone fairly points it out, would be to admit it was a bad ruling (there have been instances where I've changed things, but in instances where changing a ruling would be too disruptive, I've pointed out the flaw and made a point of the group keeping that in mind next time a similar situation arises).