Google is helping out the content creators who make videos on YouTube. They're now providing more in-depth analytics to content creators so that the creators can achieve better audience engagement and click through. The time viewed portion on analytics is an extension of the initiative YouTube started earlier this year when they started using time watched to suggest videos.
YouTube then goes on to stress that annotations are what drive audience engagement. They provide this as the reasoning behind why they have added an Annotations report to the analytics feature. The Annotations report provides insights into view click and view closure ratios so that creators can judge which annotations worked best.
YouTube has also brought back the Date slider so that creators can "adjust the date range and see how your videos performed across different time periods." All of these new features should help creators make better videos, which in turn results in a better viewing experience when surfing through YouTube.