Thank for bringing this up. I agree that the question should have stayed on Worldbuilding; what happened behind the scenes was a complicated series of events and some miscommunication.
In the interest of transparency, here's what happened:
- The OP, Aric Fowler, asked the question.
- The question garnered some votes, comments, and a close vote or two.
- A user suggested in a comment that the question be migrated to Writers, and raised a custom mod flag stating the same thing.
- I tried to talk to the Writers mods but wasn't able to get ahold of them; I talked instead to a high-rep Writers user, in chat, who's a mod elsewhere.
- I had a discussion in comments with the OP, who wanted the question to stay here. The OP then edited the question, and I deleted all the comments related to migration.
- I marked the custom flag as helpful but explained in my reply to the flag why I kept the question here.
- There were more close votes, and five community voters closed the question as off-topic.
- The system auto-flagged the question because it had attracted 20 comments in a short span.
- Another mod saw that flag and the system displayed thee text of the earlier custom flag, as far as I can tell. The mod didn't see any of the comments about how the question was edited, or the discussion I'd had with the other mod. Basically, they thought the original flag was still open and nothing had happened, and didn't see that the OP wanted the question to stay on Worldbuilding.
- The mod migrated the question to Writers.
So, there was miscommunication between a whole bunch of people here. I dealt with the custom flag and made some comments, so I'll take the blame for some of that.
What to do now
What I know of Writers seems to agree with what you said. I don't think it's a good question for that site (and I won't be surprised if it's closed there).
I think the question's a good fit for Worldbuilding after the edits. I would recommend that if the question is closed on Writers, we reopen it here. Doing so is in accordance with the OP's request and, more importantly, is more in line with the scopes of both sites.
Anyway, thanks for bringing this up on meta. It's always good to know when we mess up; we appreciate it.