Microtransaction ridden mobile gacha games where Apple takes 30% aren't exactly the target when you translate D3D12 to Metal for your desktop platform where Apple takes nothing. In practice, it is doomed to be a solution that plays the games you bought on steam 5 years ago, or run games like cyberpunk on medium 900p on your multiple-thousand dollar machine.

Apple gaming will not take off until game devs target Apple's devices, and Apple burned those bridges a long time ago.