Comment by trymas

I am not an apple framework expert, but some things in apple ecosystem are nice.

CoreImage - GPU accelerated image processing out of the box;

ML/GPU frameworks - you can get built-in, on device's GPU running ML algorithms or do computations on GPU;

Accelerate - CPU vector computations;

Doing such things probably will force you to have platform specific implementations anyway. Though as you said - makes sense only in some niches.