I see a couple of options where a frustrated user could be routed to something more constructive. I think it's ok to suggest other worldbuilding communities where the focus is about open discussion and not the question/answers format. If this were a different SE topic like Astronomy or Physics where there is usually an actual answer, sending them somewhere else would not make sense, but to be perfectly honest, there are very few questions on WB that can be answered without it being an opinion. Often what passes for "opinion" is cliches from novels members have read. The "right" answer steers towards the conventional, sometimes creating unhelpful dogma wars as if the answer is actually "true" and not just something that was explored by a pulp author in the '70s. Contrary to this site being an inspiration for ideas, I tend to look here for what is mundane so I know how to play with it.
That said, I think too many questions on WB are put on hold. I've had questions that were rewarded with badges, yet I still have questions that get put on hold. I'm never going to tie myself into a pretzel to get a question past the semantics-police. I'm not saying it's unwarranted. Maybe I could have worded it differently to fit the SE format (and I guess I'm still a little vague because I don't deliberately break the rules), but if a question isn't complete word-salad or bizarrely specific, it will get a few honest helpful answers before it gets put in jail. That's usually enough for me. If I'm asking a question it's because I am writing about it, not because I am trying to make an epic question for the SE–WB hall of fame.
Sometimes bad questions have good answers. I can't link to any examples of course because they get auto-deleted. One that comes to mind was someone who had read about a "dark matter drive" and asked how it worked. He got a few insulting comments, but also two EXCELLENT full answers that not only explained the fallacy but gave examples where using a "mysterious element X" trope worked in a story. It might have been a question that pinged high on a search engine, but it was deemed as nonsense. Meanwhile I cringe every time I read another necromancy/zombie question, yet I resist flooding those post with hater comments telling the OP how unscientific he sounds with walking skeletons…. I looked back at some discussions about WB allowing "magic". Before my time, but I'm guessing a lot of good questions were lost because of aggressive closing for it to become an issue…. A little more "Rights of Man" and a lot less arbitrary Kafka politics would be fine.
We keep being assured that it takes five members to close a topic, as if 5 is a large "safe" number, 5 people killing a topic in which > 5 people have already participated… It's more than just the OP that is getting deleted. If OP has a few answers from a reasonable members, there isn't much incentive to edit the question – I know I don't. If a question has upvotes, and answers have upvotes, why are you closing it? The criteria for a well-received question should be much higher to close. Period. This is a recipe for abusers, not a democracy. Please stop lecturing about "majority has spoken" when you allow 5 people to kill a discussion other members have already worked on. Look at Gamergate, Hugo Awards, the 2017 Election for examples where a minority of trolls destroy a good thing.
Trolls are a problem here. I got goaded into explaining parts of my world that didn't pertain to the question, technical ideas I feel are original that I don't necessarily want to become common knowledge until I get a chance to use them. After "winning" the right to ask my question by proving I'd solved the cliche they were trying to force on me, none of the trolls bothered to answer anyway. Comments are intended to expand the topic, not to troll it to death. I resented that I'd revealed my details and went back to edit that part out of my question, but it's still there under the edits.... Now I'm perfectly fine when my questions get deleted. I'll keep my explorations to myself, thanks. It helps to 100% ignore comments (or at least never respond, if you read them). There is no option to block or mute regular trolls. That allows this site to be hostile about women's bodies and minority rights. There are GREAT people here too, but they won't waste their day trolling a topic. It's exhausting, and the good signal is drowned by a lot of noise and nonsense.
Web community formats dictate the type of discussion: forums, Q/A, thread feeds, etc. if SE-WB admitted its limits, and presented itself as a QUESTION ARCHIVE TOOL, there could be a sub-community with looser rules (maybe not accessible by outside search engines), or a writers'-oriented page that lists some other communities, maybe having a question shut down because it doesn't fit the SE format might not seem as harsh – "it's ok, this just isn't the web-format for an open discussion, nothing personal and either re-word or try this other place…". SE-WB is not the strictest, Physics(dot)org has a WB section that has so many rules about what's taboo it's practically totalitarian. I've discovered some fantasy-WB communities that are the opposite where everyone gets a scented candle and a dreamcatcher (lol, ok, exaggeration). Reddit has Worldbuilding subs for NSFW and one that is just for being a jerk, LOL very Reddit. I've found a few groups on Facebook too, if that's your thing. It's ok that SE is not for every topic. I think we could do better, but I also think there is no harm in admitting the limits of the format. People don't have to feel rejected if maybe they can be redirected.