For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
My personal pet peeve is pre-installed, un-removable software and apps. My current mobile phone for example has apps that link to twitter, facebook, amazon etc. none of which I will ever use, but you can somehow not delete them. Why do I need to have that virtual junk in my phone?
Especially when they can be DISABLED, but not UNINSTALLED. Grinds my gears.
This might help you. https://github.com/0x192/universal-android-debloater