You cannot ‘just’ target Vulkan and then assume it works everywhere any Vulkan is supported. There are differences between vulkan implementations and like OpenG

You cannot ‘just’ target Vulkan and then assume it works everywhere any Vulkan is supported. There are differences between vulkan implementations and like OpenGL it has a lot og optional parts. Some vulkan code can work on an Amd card but throw validation errors on an nvidia card And vulkan does not support some methods that e.g. metal has natively (and vice versa of course)