Former journalist here. This structure is also known as "inverted pyramid"[0]. CIA has a book[1] that details the process to apply the structure recursively to build an article.

Beware of the potential pitfalls of "stating the key first":

1. The key point might be complex and requires a build up – rushing to the point could confuse your readers;

2. What's "most important" depends on the reader and if you write for a wide audience, it is not always obvious;

3. If you design your writing to be "modular", readers could be more likely to abandon your work prematurely;

4. Sometimes the most important detail is that you are taking the time and being patient to communicate, and making a point with little context could alienate;

5. You could feel lazy and not control the complexity of your article because "I already made it easy for the readers to skim and skip!".

[0] https://en.wikipedia.org/wiki/Inverted_pyramid_(journalism)

[1] https://cdn.ymaws.com/www.scip.org/resource/resmgr/White_Pap...