It's kinda funny to me.
4:3 isn't a traditional aspect ratio for still photography. Your typical 35 mm film camera took pictures in a 3:2 aspect ratio.
The only reason digital cameras used 4:3 was because that was the native aspect ratio of electronic displays at the time...but it's not anymore! So the 4:3 format of still photos is a relic of the computer monitors made before 16:9 ruled the world. Weird, eh?
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Like, my phone's camera is natively 4:3, in that those are the physical dimensions of the sensor. So I can set it to take pictures in a 16:9 mode, but it will just crop off the top and bottom and I end up not making use of the full possible resolution.