Is there a reason WorkflowBuilder doesn't emit Workflow Events?

[MaguireKrist-ITK]

When following the tutorial on workflows you're told about Executors and how you can chain them together with Workflows. You are also told about the events a workflow can emit. HOWEVER, it appears that the Workflow events:
// Workflow lifecycle events
WorkflowStartedEvent // Workflow execution begins
WorkflowOutputEvent // Workflow outputs data
WorkflowErrorEvent // Workflow encounters an error
WorkflowWarningEvent // Workflow encountered a warning

only get triggered when running a workflow with AgentWorkflowBuilder not with WorkflowBuilder.

Example:

var insightExecutor = services.GetRequiredService<FixSuggestionExecutor>();
var debuggerExecutor = services.GetRequiredService<DebuggerExecutor>();


var workflow = new WorkflowBuilder(insightExecutor)
    .AddEdge(insightExecutor, debuggerExecutor)
    .Build();
    
  var run = await InProcessExecution.RunAsync(workflow, prompt);
  List<FixSuggestionDebugResult>? results = null;

  foreach (WorkflowEvent ev in run.OutgoingEvents)
  {
      if (ev is WorkflowOutputEvent outputEvent &&
          outputEvent.Is<List<FixSuggestionDebugResult>>(out var output))
      {
          results = output;
          break;
      }
  }

The above will not emit a WorkflowOutputEvent...

But the following does:

            var workflow = AgentWorkflowBuilder.BuildConcurrent(
                "Debugger Concurrent",
                agents,
                AggregateAgentOutputs);

            var run = await InProcessExecution.Concurrent.RunAsync(
                workflow,
                new List<ChatMessage> { new(ChatRole.User, DefaultPrompt) },
                cancellationToken: cancellationToken);

And it's not clear at ALL in the documentation as to why.... any help here?