The poor game support on macOS is a mix of Apple apathy towards gaming and the low potential sales numbers.
Also, of the few new Vulkan apps being released (a whopping 9 in 2023), most actually only support a single platform:
https://carette.xyz/posts/state_of_vulkan_2024/
Apple also offers a D3D12 porting toolkit now (basically D3D12 running on top of Metal, same thing like Proton is D3D running on top of Vulkan) which business-wise makes a lot more sense than native Vulkan support since there are many more D3D12 games than Vulkan games: https://developer.apple.com/games/