For multiple reasons:

• If you're using more than one platform frequently and simultaneously, then you need the kuandoHUB to prioritize which platform(s) dictate the presence of your Busylight.
• The kuandoHUB is a very handy tool in optimizing your workflow, with Hotkeys, kuandoTIMER, Outlook Options and much more.
• In general, it makes your Busylight more customizable