Bedrockgames
I post in the voice of Christopher Walken
Isn't plausibility the same as player expectations in the context of a fantasy TTRPG? Isn't that the whole point of Enrahim's post?
I guess what I am saying is plausibility is going to factor in what players expect to be plausible. If an NPC holds a ring over a pit of lava and releases it, they expect it to fall (and likely fall into the lava). But expectations can get different as you get into more things. Like if you shoot a gas tank on a car should the car potentially explode? If you are in the right action movie franchise, that is a plausible outcome of that action. If you are in the real world, I'm actually not sure, but I suspect it wouldn't blow up, or at least would be a lot less likely to combust the way it does on film. I call this knowing what franchise you are in. But just because you are in a franchise, that doesn't mean plausibility doesn't matter. Your players are using plausibility as part of their way of understanding how the world behaves.
Plausibility seems to melt away as a factor, if clear expectations about the way a world works are defined. We do it for magic all the time. It's just that expectation is inherent in many systems, so it's not discussed. But if something falls within player expectations for a world, it also falls within their expectations of what is plausible in that world.
When we label "plausibility" as a separate idea from player expectations things get weird. All of a sudden worlds with slightly different rules become almost problematic because they break this nebulous idea of plausibility even if they fall within player expectations.
Again, I take the view that plausibility can vary from one type of setting to another. I think something we have seen though in this thread, and what some folks are talking about, is setting that their campaigns are much more on the naturalistic side of the spectrum, so they expect plausibility that feels closer to our world's than to say John Wick's world
So I would guess that plausibility is really just player expectations by a different name. As I can, theoretically, get player's to expect implausible events and not run into issues because I am still meeting player expectations even if violating plausibility in a general sense.
I don't think it is just player expectation by a different name, but I think you want to get people on the same page in terms of knowing what franchise they are in and what kind of setting that are in