It's an Apple chip with no documentation and zero existent driver code to reference. You have to set realistic expectations here, and acknowledge that not every contributor is going to have the domain-specific knowledge required to make everything work. It's nothing short of a divine miracle that it has working Vulkan drivers you can download within a half-decade of it's release.

If you want more, you'll have to take it up with Tim Cook or God (both have a nasty habit of ignoring us little guys). Also an option: not using a laptop that treats Linux as a threat to it's business model.