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I think it just got sort of replaced by the "always on display" as Android calls it, where the screen is "off" but still displays the system clock and any notification icons received. For me, it's accomplished the same thing while being more specific than the LED
It's also worth noting that most phones these days always have at least one item in the "notification" bar at some point. Like, right now I've got two apps taking up a slot, and Google's weather thing up there, and that's a normal day.
The LED would always be on.
Nah. They used to flash different colours for different events, and you could filter what created an LED event. Even with the OLED screen, leaving the notification/clock on all day drains the battery noticeably more than having it disabled. I find it better to only have that on at night when charging. Not to mention you didn't need to look at the screen. You'd see the flashing light and know there's something to check.
But, what they COULD do is simulate a series of LEDs properly with OLED. That should in theory take a similar amount of power (for the screen at least) as a real LED. But, I suspect driving part of the screen would require the screen controller active. I suspect the older phones with LEDs had some separate low power driver storing the most recent events from when the phone last "woke up" using minimal power for the flashing LEDs.
So, in all it genuinely is a missing feature that has no equivalent in modern phones.
Maybe older models were a lot less efficient with always on display, but I just checked for my Pixel 8 Pro and the ambient display was <1% battery usage.
Don't think an S20+ is that old. I turned it on full time just after I posted that last comment, just on the edge of the screen. Low brightness. 3.5% of the battery use in 5 hours.