My initial response is "no, we shouldn't set guidelines". Aviation is a technical field, and even if the laymen asking questions won't necessarily have the level of familiarity necessary to get everything, they also may not understand the concept correctly if non-aviation terms are used. I use may here because there is no way to know for sure, every time.
That said: I think that we should encourage the use of parentheticals, links to explanations, or even full-blown explanations in addition to the technical terms. Not every expert on here is a flight instructor, and not everybody knows how to explain things to everyone's satisfaction - we all learn differently. We should also be comfortable asking for more information, or editing posts as needed to provide information that wasn't given.
tl,dr: If you see a post that uses technical terms with no explanation or synonyms given, ask in the comments or edit itadd the explanations yourself for clarity!