Adding proposed concluding thoughts

Co-authored-by: Chris Gillum <[email protected]>
Signed-off-by: Whit Waldo <[email protected]>

daprdocs/content/en/developing-applications/building-blocks/workflow/workflow-patterns.md

@@ -624,6 +624,8 @@ await context.CallActivityAsync("PostResults", sum);
 
 {{< /tabs >}}
 
+Limiting the degree of concurrency in this way can be useful for limiting contention against shared resources. For example, if the activities need to call into external resources that have their own concurrency limits, like a databases or external APIs, it can be useful to ensure that no more than a specified number of activities call that resource concurrently.
+
 ## Async HTTP APIs
 
 Asynchronous HTTP APIs are typically implemented using the [Asynchronous Request-Reply pattern](https://learn.microsoft.com/azure/architecture/patterns/async-request-reply). Implementing this pattern traditionally involves the following: