Right now, the year of a post or comment is not shown if the date falls within the current year, only the month and day.
This means that anyone hoping to screenshot a question to share it somewhere on social media, or to archive it in some fashion for whatever reason will need to take an extra precaution to mark the year of the question.
Even if someone wanted to share something that was posted this morning, by not displaying the year, it would be almost impossible to know if the content is from this morning or from ten years ago.
This may or may not be more important in non-programming sites.
In my opinion, I don't see any merit in the current format since it just creates inconsistency overall for little benefit.