Hardly any AAA companies are optimising for the Apple GPU. MoltenVK is where all the interest is.

Even if they did, there is very little in Apple Arcade which taxes the GPU, most target the lowest common denominator in terms of supported iOS/phone combinations.

The original Apple Arcade strategy was for AAA titles, but for whatever reason that wasn’t pursued, so now we have a tonne of casual games and re-releases of old titles.

Apple just seems to run hot and cold on gaming.