Vulkan only has traction on Android, and a couple of Linux titles.
Metal has 20% of the desktop market, and whole of the iOS/iPad/watchOS markets combined.
Even with Android market share, many folks keep using OpenGL ES, because Vulkan tooling on Android sucks and isn't available to Java/Kotlin developers like OpenGL ES is, so only game engines like Godot/Unreal/Unity make use of Vulkan in practice.
Metal has 20% of the desktop market, and whole of the iOS/iPad/watchOS markets combined.
Even with Android market share, many folks keep using OpenGL ES, because Vulkan tooling on Android sucks and isn't available to Java/Kotlin developers like OpenGL ES is, so only game engines like Godot/Unreal/Unity make use of Vulkan in practice.