Well, that's not exactly the reason, although we you are probably right - a more general assumption is that we try to keep our default hosted service as simple as possible. You know, the more moving parts a system has, the more it is prone to errors and malfunction.
Whereas with RU Server we can experiment and add more advanced features. By the way, using e-mail for what you described is probably overkill. If both Host and View keep connection with the RU Server alive a notification (or a desktop alert) could appear right in the Viewer. So we'll give it a thought and adjust our plans regarding the RU Server roadmap accordingly.