Why does iPhone 11 Pro Max does not support 4K 60 FPS video on a .buildInTripleCamera in AVFoundation?

I've got a code which is searching through all available camera devices in AVFoundation to select the best device supporting expected resolution and framerate.

I am searching for 4K resolution (3840x2160) video running at 60 FPS on a rear camera.
I am expecting to get a .buildInTripleCamera - just like a native camera app.

Looks like there is no AVCaptureDevice.Format in .buildInTripleCamera that has 4k 60FPS. Only .builtInUltraWideCamera supports this.

It is weird, because on a native camera app it is using 3 lenses, however when you start recording, you're limited to only 1 lens.

I am trying to get as close to the native app as possible.
Do you know how can I get triple camera enabled with 4k format running at 60 FPS?
Why does iPhone 11 Pro Max does not support 4K 60 FPS video on a .buildInTripleCamera in AVFoundation?
 
 
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