If you used metal as the graphics api on Linux, literally no existing Linux software would work with it unless you also used a layer like MoltenGL or MoltenVK (

If you used metal as the graphics api on Linux, literally no existing Linux software would work with it unless you also used a layer like MoltenGL or MoltenVK (which have been written for a Mac system and would likely need modification). Linux graphics drivers also tend to have extra APIs for buffer management for X11/Wayland, which a molten compat layer probably doesn't do as molten is meant to run in-process with each app I believe. Some of the Metal APIs are also a little intertwined with swift and objc.