For the record, I am leaning in support to this proposition but I think it could be implemented with Meta as well.
The Good Side :
After a discussion with @andra, I do see some positive points behind this, but I think this concept could be well utilized with the Meta instead of a separate feature, even though a separate feature would be nice.
Chain of arguments which I feel are for this idea/concept:-
Allowing a separate section in the FAQ which can link to the canonical questions.
Providing reasonable and short explanations for how to easily check information on commonly asked questions using resources already on the internet.
Using these resources can be complicated and a step by step solution can be provided in these canonical answers with an effective TL;DR
Using these resources teaches a man "How to Fish" rather than providing him with a fish
Allows us to fish out bad quality content from the website while avoiding unnecessary traffic, thereby adhering to Quality vs. Quantity
Users don't particularly enjoy fishing out the right answers and neither do the frequent users enjoy seeing visa questions everyday. It would be nice to have something like this which allows us to easily avoid the answers which could be answered with a link.
The Bad Side :
My opinion on this is still the same as on the question you linked earlier.
Chain of arguments which I feel are against this idea/concept :-
When @Relaxed tried this, Do I need a visa to transit in the Schengen area? it lead to a giant wall of text. Even though I did up vote his efforts when he made this.
No matter how hard you try, there are always going to be little nitty grities which are going to be specific to one nationality or country. Eg. Traveling to the US or I'm an Indian citizen (Visa-free transit in almost all Schengen countries except some).
Even though answers to these nitty grities are available on the websites you mentioned, searching them again and again, I think that's harder than reading an answer which has already been created.
Not supportive in terms of the amount of traffic it can generate to be website. People see complicated things, they don't read. Simple. (Remember the TL;DRs? I doubt a useful TL;DR can exist for such questions)
Some rules are liable to change very fast, this would require a lot of maintenance by us on this question. Croatia and other countries are in the process of joining the Schengen Area, they have complicated rules.
So, in my opinion, I'd rather answer a fresh question where I'm sure that I'm not providing someone with stale information. Rather than try all my might trying to maintain the stale information and marking every other incoming question as a duplicate.