People have been focused on getting stable diffusion running well on M1 macs because their graphics systems have so much more horsepower than the Intel macs. The M1s also have a fast memory sharing architecture for graphics, and this needs an absolute minimum of around 8gb of vram — many Intel macs just won’t be able to handle this.
That's good to know as I just got a good deal on one and was wondering if the AMD GPU would be useful or if I needed to start planning for an eGPU with some NVidia silicon. Thanks!