It’s called Digital Wellbeing now, but same idea.
You can also set “Screen Time Reminders” that pop up every 5 minutes to show you how long you’ve been in the app.
Also, in this same space, you can set App Limits and set a certain amount of time an app is available while using the screen. This is not counted if it’s in the background or the screen is off. So, if you have a limit on Youtube, but use it in the background to listen to podcasts or music it doesn’t count towards the limits.
I don’t know of any other app that provides the kind of basic functionality already built into the OS. Also, if they update to suddenly do something nefarious, you’ve given them admin permissions to know app usage, and draw over apps so they can show you the time. What else could they do with those permissions if you just update without reading fully?
Think of the definition as a sluice gate. When you allow more things through, you’re opening it wider, therefore broadening the definition. I know it’s counter-intuitive sometimes to think of it like that. Narrowing the definition would be to let fewer things through, thus closing the gate.
Edit: Reading through the discourse below, I think I see the points made. It might should be reversed.