Following specification vs. following language standards

The way I see it, this question follows The Six Subjective Question Guidelines:

1. It inspires answers that explain "why". Options are given, so I need reasons.
2. Long answers are expected which provide example implementations and reasons for designing them that way (like why XDocument does not follow specification).
3. It's not a holy war topic, so constructive tone is expected.
4. It invites sharing experiences, because there're many standards implemented both by Microsoft and third-parties.
5. As per above, facts and references are expected.
6. And finally, it's a very important practical question about designing libraries.

The way I see it, the question perfectly fits Programmers scope: conceptual questions about software development. It is about software architecture which is declared as on-topic by FAQ.

So, the question is: why was the question closed and how to fix it to get it reopened?