"Technology should help you with your life, not distract you from it. "
and then
"A new Dashboard, for instance, shows you how you’re spending time on your device, including time spent in apps, how many times you’ve unlocked your phone, and how many notifications you’ve received."
Who cares? What am I supposed to do with this information? (Apart from Google, of course.)
Lots of people spend way too much time on their phones and want to use it less. That info could help you see what apps you're spending/wasting the most time on and help you decide to cut back on. Seeing that you spent a whole hour on instagram is a helpful wake up call.
Seeing which apps are sending more notifications could help you see which ones are taking up too much of your attention and help you decide whether to turn them off for them.