MTLMeshRenderPipelineState

Looking at the documentation for the methods to create MTLRenderPipelineStates I'm trying to understand the differences between the different RenderPipelineStates created by using:

• MTLRenderPipelineStateDesciptor (5 methods)
• MTLTileRenderPipelineDescriptor (3 methods)
• MTLMeshRenderPipelineDescriptor (2 methods)

Not all methods that exist for the MTLRenderPipelineDescriptor case exist for the Tile and Mesh variants and I was wondering why. The only way to synchronously make a Mesh PipelineState is currently by this method:

func makeRenderPipelineState(
    descriptor: MTLMeshRenderPipelineDescriptor,
    options: MTLPipelineOption
) throws -> (MTLRenderPipelineState, MTLRenderPipelineReflection?)

which also creates a MTLRenderPipelineReflection?

Is there a clear reason for that which I just fail to understand? Or are these methods just not there at the moment?

The example code in https://developer.apple.com/wwdc22/10162 does not compile for example.

// initialize pipeline state object
var meshPipeline: MTLRenderPipelineState! 
do {
    meshPipeline = try device.makeRenderPipelineState(descriptor: meshPipelineDescriptor)
} catch {
    print(“Error when creating pipeline state: \(error)\”)
}