If I had to guess, the diversity of Android hardware and operating system versions in the wild make delivering a quality experience more difficult compared to the narrower range of Apple devices and their generally higher specification of processors and cameras.
And if I were to wildly speculate, Apple phone owners are a more desirable demographic to pursue over the long run.
Please get your facts straight before your distort them :)
Windows phone (now w10 mobile) camera has supported these stuff for some years now (either natively or via extensions). Don't forget that "Live Photo" is Apples implementation of an old Nokia technology.
Windows Phone is no more. The current OS on Microsoft phones is Windows 10 Mobile. It includes Lumia Tools for editing and the Camera app appears to have similar image processing for faces and scenes based on my experience [yes, I own a Microsoft phone].
