To start with the simple case: with DnD, we tag by edition like dnd-5e, dnd-3.5e, pathfinder etc. It's an understandable practice, as rules and content vary wildly by edition. A question regarding a particular edition could almost never be answered by sources of another edition, and dungeons-and-dragons is used for questions that consider the franchise as whole.
But that sort of difference between editions, while not limited to DnD, is not universal among RPG systems. For example, Apocalypse World 1e and 2e are very similar in content and especially underlying mechanics, to the point where edition-specific questions are far, far harder to come by than edition-agnostic ones. This makes me sort of fuzzy on how we should actually tag the questions.
Looking at apocalypse-world, by far most of the questions would have identical answers for 1e and 2e. apocalypse-world-2e doesn't have a single question whose answer isn't equally relevant to 1e. Knowing that any answers are likely to apply to both editions makes me want to tag questions as both, but if one always wants to use two tags, couldn't they just be one?
What is the proper usage of the edition-specific tags with Apocalypse World and other systems, where edition differences tend to remain minor?