During web performance or coded UI test recording. All web popup dialogs open in full window and cannot be closed. example window.open("");
This stops all recording going forward. This needs to be addressed because many web applications use popup search dialogs.
I'd also say that if you are going to compete with load runner and other testing applications. You should fully support most basic web functionality. I work for a very large company and we need to switch from load runner to another application. I would be able to suggest VS load testing on Azure... If i could progress past these issues.