Yes, that's how the structure of journalistic writing used to be. Necessary information and main takeaway followed by additional context.

Now you get a clickbait headline followed by a paragraph and a half getting to the main point, but just before it does, the paywall, subscription box, or whatever appears. Because of that, occasionally people will provide the main idea/point (tl;dr), and people then decide whether they'd like to read it or not.

Your concern, I think, which I happen to agree with, is that people less and less bother to then read the article to gain better understanding or context. But it's worth realizing that in a time when people read a lot more, headlines actually served roughly the same purpose as a tl;dr does.