The issue of whether headlines and "headlinese" is on-topic came up because of the question “petition on X” in “Response to We The People Petition on the Protests in Hong Kong”. I don't think it was a great question in its initial form and I'm a little conflicted about whether analyzing the grammar and vocabulary in a headline is something that would be a good use of the community's time. There was a comment in the discussion under the question indicating that someone else felt headlines were off-topic, so I decided to bring it up here.
On one hand, news headlines and news articles are important for English learners to be able to understand. On the other hand, headlines by their very nature are non-standard English. They aren't complete sentences, the language is contorted to be overly concise, and there's a huge dollop of idiom and wordplay thrown in to grab reader's attention.
I feel that they are on-topic under the "Practical problems you encounter while learning English" part of the "What topics can I ask about here?". I think there is some value to helping learners decipher headlines and understand what parts of them aren't standard English because a grammar reference or dictionary isn't going to be that helpful. However, the question I linked above had way too much abstract discussion to keep it squarely in the "practical problem" category, so I wouldn't hold up that particular question as the shining example of when a headline would be on-topic.
What do y'all think?