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Are you kidding?

AVFoundation is in nearly every way superior to QuickTime, minus the fact that you couldn't make ref movies with it until El Capitan.

QuickTime's API sucks in comparison.

Source: I write a video editor for macOS.

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Not kidding at all. There was a lot of noise during the transition on various mailing lists, as I recall. Even as an end-user the issue presented quite a few problems. While AVFoundation is generally a better API it remains less capable than the QuickTime umbrella was. Again refer to the functionality provided by vDig and Sequencer APIs. A simple case: try to slap together a video mixing app sometime that takes input from the camera or other source, processes some effects on it, and dumps the output back as pseudo device that can be used by other apps. Unless things have changed drastically the last time I looked into the matter, such a thing isn't possible within the constraints of AVFoundation itself. You have to resort to the essentially undocumented CoreMedia IO API. Apple does provide similar functionality for other types of devices at a higher level i.e. scanners, digital cameras via some other API I can't recall off the top of my head at the moment. =]

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