I'm guessing it's because Macs are a second-class-citizen when it comes to Blender's technology stack. Intel has a hardware-accelerated denoiser, Nvidia has hardware-accelerated ray tracing, and Macbooks have... pretty much none of that.
In all fairness though, I'd imagine a big chunk of this being Metal's fault. I'd be dragging my feet too if I found out that I had to re-write our graphics backend just to support >8% of the desktop market share.
In all fairness though, I'd imagine a big chunk of this being Metal's fault. I'd be dragging my feet too if I found out that I had to re-write our graphics backend just to support >8% of the desktop market share.