We've discussed answers like that, at length, before. The most notable post is most likely Should we be more strict about one-line answers?.
A good subjective answer meets a few points, described here. I'm going to quote one:
Great subjective questions tend to have long, not short, answers. The best subjective questions inspire your peers to share their actual experiences, not just post a mindless one-liner or cartoon in hopes of being rewarded with upvotes for being merely “first.” Sharing an experience takes at least one paragraph; ideally several paragraphs. If I’m asking about how to bake cookies, don’t give me a list of grocery items: milk. butter. vanilla. eggs. There is virtually nothing I can learn from a short, static list of grocery items that make up a recipe. Instead, tell me what happened the last time you made cookies from that recipe! Share your detailed experiences, so that we all might learn from them.
And this is the answer:
This answer is literally the shopping list example from the quote. Every line needs fleshing out, explaining why to take that step and why it's likely to be of more help than whatever OP has already tried. So yes, it not only 'could have used some fleshing out', but if we want IPS to succeed within a scope set by SE, the answer needs fleshing out. Having it deleted is good moderation by the people using this site. OP is free to edit their answer, and only then can we think about undeleting it. There's comments there pointing out what should be improved, so that shouldn't be too hard.
As for it being blindingly obvious that this solves the problem: I personally don't see it. It doesn't mention, like you say, to move from vague statements to more concrete ones like food trucks. That is a valuable addition to the answer, and perhaps you picked up on it... I didn't. Someone that's asking about these types of things isn't likely to know that they're making too vague statements either, or they might've asked 'how to make more concrete statements'. So, it's one of the things in the answer that needs fleshing out.
Remember: Closing, Editing, Commenting, Deleting... all of these actions are done to give people a chance and time to improve their posts, they don't come with penalties (except for a few exceptions). This post now has two downvotes. If it is edited, improved, and undeleted, it has a better chance of recovering than if we'd have left it around longer, but all downvoted it to double digits because it didn't meet the most basic standards for answers on subjective sites. Deletion in thirteen hours isn't too quick for a post that should never have been posted in that shape in the first place.