Vote, answer, or move on.
Some days I've seen a question like that and downvoted for "lack of effort." Some days I jump right in and derive some joy from helping someone sort out a crease in the game's rules. And some days I just don't have the interest in engaging with one more notch-above-basic-understanding (5e, especially) question.
I do try to ...
Closure isn't the appropriate response here
You correctly point out that no close reason really fits, and the reason for that is because there's no real issue with that question as the community or SE has defined it thus far that would necessitate closure as the best response for this type of question.
The reason we close questions here is generally, because ...
Nothing...or downvote them.
People can ask pretty much whatever they want. If it's off-topic or any other standard concern, we can close it.
But these questions aren't off-topic. They are just poorly researched to start with. And for me, that's generally a downvote.
If others like them, or are ambivalent, they can upvote or not vote as they see fit.
I do not ...
The is no such thing as a straightforward answer
Hypothetical questions with clear, straightforward answers don't get asked because the OP can see the clear, straightforward answer. If an OP has taken the time to write the question then they are asking because the answer is not clear and straightforward to them! Hanlon's razor applies.
It's the answerer's ...
As others have said; Answer, Down vote, or Ignore
I believe some of this emotion is based on other "stacks".
On the developer-related stackoverflow-side of things you see these types of questions all the time. The, "Do my homework for me," and the "Help me do this thing with no details" style questions. But in those cases, it's very easy to ask, "What have ...