[cestith]

ARM is a CPU ISA. A MacBook is a whole computer. A general purpose OS to be really useful needs to support the CPU, yes, but also the boot hardware, the bus, the video devices, keyboard, pointing devices, speakers, mic, line in, line out, the network hardware, internal storage, external storage, and preferably any peripheral through the USB ports or wirelessly that's USB or Bluetooth with a standard profile.

Also remember that M1 is not only ARM. It's a SOC which combines ARM cores with GPU cores and AI-targeted cores. Targeting just that is a lot more work than just porting the ARM portion from a Raspberry Pi or an Android phone. I'm sure just getting a framebuffer up was a lot of new work. Fully supporting the GPU cores will be necessary for a lot of people's use cases. Once that and most of the peripherals are sorted, maybe the AI cores will be addressed.