In a comment on a Monsters & Manuals post, knobgobbler wrote:
One of the reasons I won’t GM for my regular Saturday group is because I KNOW those guys will pick apart anything I run… ‘Oh! that aqueduct wouldn’t work that way!… and ‘Oh! You’ve got the physics of that all wrong!’ I’m really reluctant nowadays to run anything for self-proclaimed ‘gamers.’
This experience is alien to me. Anything like aqueduct mechanics is a mystery, from the PC point of view. Sometimes I will know why the (for example) aqueduct works the way it does, because that will be something that I have thought about, and sometimes I won’t (it’s obviously impractical, not to mention boring, to think over every fictional thing beforehand).
In either case though, if a player ever says something like “hey, that doesn’t make sense!” the response would be: yeah, that’s kind of mysterious, do you want to investigate, and if so how? If I already know some backstory, then the player can figure it out through adventuring, and if I don’t, then we can figure it out together.