When I open Screen Time, I see these gray bars. I know my phone screen time isn't this high so I asked someone at the Apple Store and he said it was background activity from various apps and that there isn't a way to not show this in the Screen Time calculation. I'm curious, if this is the case, do most people find little value in Screen Time? I really just want to know how much time am I actually using my phone, which I think are the colored bars.