I accept that I’ve maybe lost this case, but I still tell only one thing.
I work sometimes also a photographer for the company I work in, so I know quite a some things about photography. I always work with my DSLR camera in full manual mode. It means that I adjust aperture, shutter speed, ISO, focal length, EV, flash… etc. For my photos manually and those settings of course can change at almost every photo I take.
But I know Photographes who uses A S or P modes in their camera. Those settings are for those who don’t care to adjust all of the settings mentioned previously. For example A mode is an Aperture priority mode. It allows photographer to change the Aperture settings to what ever he wants to and camera will adjust shutter speed.
S Shutter speed priority mode is of course opposite version of that previous and lets the photographer adjust shutter speed while camera is changing aperture automatically.
P setting will give a photographer some of the combinations to choose of aperture / shutter where he will get the exposure the camera will see as optimal.
And then there is that full auto mode that will change even ISO automatically.
I would use it, if Blender changes automatically censor size to make sure that the render picture frames works as expected. Of course other people who loves to adjust the camera at every time, could keep doing it.