It's rare for a company to create a product and then create options for users to self-impose time limits on those items. That is precisely what Screen Time does in iOS 12, allowing the user to set self-impose time limits on apps and phone usage.
Some may not want to know the truths of how much time they spend on their phone device. Some may be curious, but not want to set limits or have to hit the snooze when they've used up their 15 minutes on Twitter and the screen goes gray.
Maybe you stand somewhere in between curiousity and ready to live more of life off your screen, check out the interesting details in this article from CNN.