Relating to this question.
Since when can a question be closed for poor quality? The two respondants to my challenge to justify the closure said that it's just a physics question (which we answer all the time.) which isn't listed as off-topic in the Help Center. The ONLY rules I know of for justifying closure are those in the Tour and Help Center.
I am completely in favor of modifying the Tour and Help Center to reflect tighter and clearer rules and expectations. I've brought various issues up myself a number of times over the months I've been participating, but it never leads to an actual change. I've learned a great deal from the discussions, but nothing ever changes.
But without that change, the only rules we have are the rules listed in Tour and Help Center. Period.
I'd tolerate using Meta posts if (a) there actually were meta posts that clearly and specifically explained the new rules, (b) those posts had any kind of visible consensus (like a well-upvoted post with supporting upvoted commentary as answers), and (c) those posts were regularly used to guide participants. The only example of this I'm comfortable with at this time is the new, updated expectations for the Anatomically Correct series.
However, it is nevertheless unfair and unrealistic to expect newcomers to abide by rules that are only in the heads of other participants or hidden somewhere in meta.
Which is a long way of saying, you can't close a question simply because it's a physics question because there is NOTHING in the Tour or the Help Center that says it can't be!
Either we need to figure out how to change the Tour and Help Center to reflect narrower rules or we need to live with the fact that those rules are what we have to work with.
Our closure process is too much of a moving target! Frankly, despite SE's basic custom of not requiring VTCers to leave justification for their closure — and since we cannot trust VTCers to use the pre-defined justification according to the established rules — then if you're unwilling to leave a comment explaining EXACTLY where in the Tour or Help Center your justification comes from, then you should be downvoting and moving on. Not voting to close the question.
And to prove my point, the linked question was closed as off-topic because it's not "about worldbuilding, within the scope defined in the help center."
Show me where in the Help Center you found justification to close this question. You used the excuse. Prove it.
Postscript: The downvote button's rollover states:
This question does not show any research effort; it is unclear or not useful.
...and downvoting is all it deserved. It violated no off-topic rule listed in the Tour or the Help Center.
Post-postscript. I found this wonderful analysis by moderator Michael Kjörling that I would like people to consider as they answer.
EDIT: Please note that James closed this question both because it's a duplicate, but also because the conversation has matured and needed to shift to the new moderator-driven perspective.