A shame to see this amazing tweak abandoned, was extremely useful. Are there any alternatives to lower the brightness further than default on Android Q?
Wasn't able to find the tweak in Gravitybox that you were referring to, I assume it must've been removed in the latest version(s).
I found the apk on a russian site called trashbox, works fine on lineageos 18.1
I've been using the app "Darker" since Android 10. it overlays the status bar and has Tasker commands