Most of the readers of this site are not in India. As such, a basic understanding of Indian politics should not be required to read a question. As is, the largely European and American readership is going to see demonetization and go "Huh?"
By contrast, readers of Stack Overflow will mostly be computer science majors (current or past), who should know what an integer, complexity analysis, and sorting methods are. Those are basic to many questions on the site. The analogy would only work if this site were about Current Events in India (which demonetization definitely was).
The kind of terms that would be that important on this site are things like first-past-the-post, IRV, and proportional representation. If someone asked what those were, then we could reasonably tell them to click the tags. Perhaps even Brexit, Trump, and such, as those are single country terms that are internationally known. But we have exactly one question on Modi's demonetization.
This site has experts in politics and political science. Expecting people to know what black money is? Not a big deal. Expecting people to know that India is currently trying to fight black money by replacing large denomination bills in a process that it calls demonetization? That's a much bigger leap. That question is the first time that I heard about it. And it's difficult to search since it's not really clear what they're discussing.
If the terms are really that obvious to anyone with even a cursory knowledge of world affairs, then the obvious thing is for people to edit the explanation into the question.
I would also point out that this particular question might be best answered by an expert on currency rather than an expert on India. Because demonetization is an Indian term rather than an economics term, as stands, the question is unclear about its main topic to the type of experts who could answer it.
It's also unclear:
- Why they think that demonetization did not work.
- What a Modi is.
- How this relates to black money.
- How this relates to higher denomination notes.
It's certainly possible to explain those things. For example, this answer does so. But what it does not do is explain why demonetization would help if it does not address black money. It's not even sure that demonetization did not counter problems with black money.
And that's the real problem with the question. Even if it had been clearly written, it's not evident that the question is itself sensible at this time. It's quite possible that this question should have been closed. Yet how could someone tell this since it's only intelligible to people who knew about that particular event in Indian politics.