Feedback on the Preview Button Behavior in the New Article Editor UI

Although I do like the new article editor UI, it's really confusing to me that it shows the Preview button, whether you've made edits to your article since publishing it or not. Is there a reason why they changed it to work this way? For a moment, they had a View button (or something similar) after you published the article, and then, if/when changes were made and saved, the button would then change to Preview. This approach was much simpler and worked perfectly. With the way it works now, I can't tell whether any changes have been made or not just by looking at the article in edit mode.