As most of our established users have learned, we have a strict tagging policy requiring the asker to specify the game system when asking a question in most cases. In games with substantial changes between editions, most notably Dungeons and Dragons, we also require the user to specify the edition. Questions that fail to include a system tag will get closed as unclear (unless there is a good case for the question being truly system-agnostic).
While the aforementioned policy is good, many of our questions that'd seem to concern dnd-5e are closed because the asker doesn't specify the system and fails to do so despite requests. The fifth edition is well-known for attracting new players into the game, which can result in people not even knowing what an "edition" is in this context. The fifth edition is also reputed for not being very up-front about being "fifth edition" instead of "just D&D": see Do the D&D 5e source books specify which edition they are?
To put it briefly, I think the "which edition are you playing?" question, while necessary, is a hard one to many players but can be made easier. See my self-answer for my recommendation on this.