首先是一个一般性的说明，您可以使用
yield返回null;
你也可以减少很多，比如说之前和之后

AssetBundleCreateRequest ab = AssetBundle.LoadFromFileAsync(path);

在for环路内等等。
然后在SingleDpsABLoad中，您不必等待

ab = AssetBundle.LoadFromFileAsync(....);

才能真正完成！你只要继续

dc.finihed = true

所以你可能很幸运，有时候剩下的多余的

yield return 0;

for循环中的etc只需要足够的延迟来及时加载它^^
所以你可能更愿意做一些

IEnumerator SingleDpsABLoad(DpsContainer dpsContainer)
{
    var path = Path.Combine(Application.streamingAssetsPath, dpsContainer.abName);

    if (!File.Exists(path))
    {
        Debug.LogError("Can't find path:" + path);
        yield break;
    }

    var ab = AssetBundle.LoadFromFileAsync(path);  

    // actually wait until the async operation is done
    yield return ab;

    // can also make that one async
    yield return ab.assetBundle.LoadAllAssetsAsync();

    dpsContainer.AB = ab.assetBundle;
    dpsContainer.finishLoad = true;
}

IEnumerator SingleTempGOABLoad(string abName)
{
    Debug.Log(" 1 SingleTempGOABLoad :" + abName);

    // personally I would start with that check here already
    var path = Path.Combine(Application.streamingAssetsPath, abName);

    if (!File.Exists(path))
    {
        Debug.Log("Can't find path:" + path);
        yield break;
    }
    
    if (TempABGO_Dict.ContainsKey(abName)) yield break;

    var allDps = mainManifest.GetAllDependencies(abName);
         
    foreach (var dps in allDps)
    {
        if (TempDPSAB_Dict.TryGetValue(dps, out var dpsContainer))
        {
            dpsContainer.refCount++;
        }
        else
        {
            dpsContainer = new DpsContainer(null, dps);
            
            TempDPSAB_Dict[dps] = dpsContainer;
            StartCoroutine(SingleDpsABLoad(dps));
        }
    }
    
    // using System.Linq
    yield return new WaitUntil(() => TempDPSAB_Dict.All(kvp => kvp.Value.finishLoad));
   

    var ab = AssetBundle.LoadFromFileAsync(path);
    yield return ab;

    var abReq = ab.assetBundle.LoadAllAssetsAsync<GameObject>();
    yield return abReq;

    var go = (GameObject)abReq.asset;
   
    TempABGO_Dict[abName] = new TempPrefabABPair(ab.assetBundle, go, allDps));
}