Approachable Concurrency and CoreML autogenerated model files

Using Swift
,
1

So far I understood, that setting approachable concurrency means non-isolated async for all functions by default, so when I call an async function from the main actor, it gets executed on the main actor.

Now, I’m adding @concurrent to an async method, to make it run on a new thread off the main actor, right?
So when I added @concurrent to my method:

@concurrent
func loadModels() async {
    let model = try? await YoloModel()
    
    await MainActor.run {
        self.model = model
        self.areModelsLoaded = true
    }
}

I noticed

  1. the heavy loading of the CoreML model still happens on the main thread and my SwiftUI gets slow even though the loadModels() should run on a background thread
  2. why do I even have to do await YoloModel() ? without await the compiler complains:

Main actor-isolated initializer 'init(configuration:)' cannot be called from outside of the actor; this is an error in the Swift 6 language mode

Now, the auto-generated swift file for the CoreML model doesn't have any asyncs, nor is it marked @MainActor. Is it possible that the approachable concurrency makes it implicitly only initialize on the main thread? How can I load it off the main thread?

//
// YoloModel.swift
//
// This file was automatically generated and should not be edited.
//

import CoreML

/// Class for model loading and prediction
@available(macOS 13.0, iOS 16.0, tvOS 16.0, watchOS 9.0, visionOS 1.0, *)
class YoloModel {
    let model: MLModel

// ....
    convenience init(configuration: MLModelConfiguration = MLModelConfiguration()) throws {
        try self.init(contentsOf: type(of:self).urlOfModelInThisBundle, configuration: configuration)
    }
2

PS: I mean I could turn Default Actor Isolation back to nonisolated, like it was in Xcode 16.

But I think I understand why they made MainActor the default in Xcode26.

I just can't think of a way to mark the CoreML models as non-MainActor isolated when turning Default Actor isolation to MainActor.