Great Caesar’s ghost, IMO a successful question would be one that is logical, even dealing with issues that are highly improbable, or not very plausible. The question would challenge your mind to stretch in areas you never take it, or too scared to let it go. If it does that, I believe the amount of people responding and responding with quality answers will be a byproduct of it; thus taking care of itself.
We are all suppose to be more intelligent people than AB, or YA, so I cannot see why anyone can’t take the context of a question or response and juxtapose the right word or wording in the sentence where it belongs. We are humans, we make typos, we have misused words, dangling participles, mistaken modifiers, etc. If everyone were required to hold a standard of no boo boos, I guess we would never see a vehicle with a dent or scrape of any type, but we do, so I guess people are allowed to be far worse at driving than grammar, that is scary. The outcome of a successful question to me, is one that has a meaningful direction that it is headed.