I would scratch the fully, it's not on iOS or macOS
It's like saying that assembly is better than higher level languages. So propose writing everything in assembly as the next step? Everything has its trade-offs.
Vulkan like OpenGL is leaving to the developers the effort to bring their own math library, OS integration and graphical debuggers.
For the rest most of it is hidden behind NDA walls, so you need to sign one to see the codegen examples.
Graphical debuggers on the other hand are useful indeed. LunarG stopped working on Glave: https://github.com/LunarG/VulkanTools/commit/87220f80a643860...
Not sure what happened there. Valve were sponsoring Glave development.
Renderdoc is active (not Linux UI yet however): https://github.com/baldurk/renderdoc