Version 5.7.0 update is being reviewed by Apple and has the following major change.

In prior versions of FA 5 and FA X, Intel GPU rendering did not support the comprehensive Mega2D and Mega3D variation sets.

Now using Metal, GPU rendering with Intel GPUs can use both the Mega2D and Mega3D variation sets. Unfortunately OpenCL does not support them, this is a Metal only feature.

AMD and Apple Silicon GPUs never had this limitation. Intel CPUs did not have this limitation either.