Because of how subjective interpretations of work can be, we don't feel confident we can create firm, set-in-stone guidelines on this. When contributors are creating their pitches, there will be a list of guidelines to follow, which will include a note on our rules on shipping- our plan is to trust in our contributors' intentions when creating.
In the case where the mods feel the implications are too heavy in a piece, we will contact the contributor and discuss further about it to reach a compromise.