For article posts that have a thumbnail, sometimes I just want to view the thumbnail. With the article preview option enabled, I would have to tap into the post and then tap and hold on the thumbnail there. I can't just use the regular tap and hold to preview from the feed because of the article preview feature, which I like enabled.
If the trigger for the feature was changed to tap and hold on the post title instead of the thumbnail, I can use the preview gesture to view an article or thumbnail from the feed and tap and hold on the title to open reader preview of the article.
Just an idea, and if nothing changes, I can just go into the post to preview article thumbnails.