I’ve been using ScreenTime for a couple of years now, with varying degrees of success. The ability to set time limits on particular apps is useful but easy to override, and the statistics rarely got looked at. The addition of ScreenTime to the Mac hasn’t added much for me beyond an additional weekly reminder of how much time I spent on my devices.
However, something has changed with iPadOS 15, resulting in my ScreenTime figures skyrocketing. For reasons I’ve yet to fathom, various websites that I may view briefly on the iPad are being logged as sat open in Safari for hours! This has severely dented my trust in ScreenTime’s ability to track anything reliably, and for now I’ve switched it off on all my devices. It will be a test of my willpower to avoid wasting time playing games, but I reckon I can work around that by giving myself fun projects to do.