FrogReaver
The most respectful and polite poster ever
Let me lean in on another bit about genre appropriateness. There's been a few examples in the thread about things like getting a dragon to give up it's hoard on a roll or a king his kingdom. This goes to genre appropriateness. In a genre of game that includes dragons having hoards, the genre expectation is that dragons do not give away their hoards. Similarly, in a genre that has kings, they don't give away their kingdoms on a single ask (or really multiple ones). This is where you can leverage genre logic to evaluate action declarations.
So I think we have a vastly different notion about what genre appropriateness actually means because I wouldn't relate any of that to the category of "genre appropriateness"
It's not reasonable to try to jump a 50 foot chasm in D&D as a low level character not leveraging any special means.
But the action itself - attempting to jump a 50 foot chasm is rooted in the fiction and genre. It's just we all know what the outcome will be unless there's help!
grounded in the fiction (I can justify a success and failure within the existing fiction),
See that's a helpful definition, even if I don't think your term lines up very well with that definition. You will only use existing characters to help narrate/explain a success. So no sudden angel out of nowhere etc. I think that's probably enough to keep things from outlandish results.