That all works until one day you do your big reveal and someone says "That's stupid, that can't happen". Pure narrative relies on unspoken agreement on what is possible and sometimes there are miss-understandings.
But yeh, in the end it comes down to each group's culture. D&D doesn't have a 'rules are physics' approach it has a 'board game thinly disguised' approach.
Me, I move cities so often I have to be adaptable.
There is always the possibility that the characters are woefully unaware of what can and can not happen. This is a very important part of many styles of campaigns it can make fore a much more interesting game.