The battery is always on the bottom while the notifications are in the middle or the top. It's charged if the bottom portion (or the portion closest to the USB cable) has a green icon on it.
Personally I would rather have the screen off a lot of times for various reasons. Why should i have to have the entire display on instead of having tge ability to just have a little notification light?
With OLED and especially LTPO OLED that's not exactly an issue though, since it's only the icons that make up the active parts of the display, while the whole black area of the display is literally off.
Except that my screen isn't an OLED and I don't want to leave the display on. It's too distracting, it needs to be off especially at work. A little dot isn't too intrusive as a notification.
LCD fanboys have lost the mobile space. Pretty much all the mid-range to flagship phones have an OLED screen by now and we start to see OLED on laptops and desktop monitors as well. Don't you think it's time to move on at this point?