My hosting provider offers Weebly, but with Weebly, do I need a hosting provider?

I run a website for my wife's harp profession...used to use FrontPage back in the day. Now I am looking for something simple. My IPOWER host offers a drag and drop design with Weebly. But when I go to the Weebly website, it appears that they provide the space for free. My ultimate question is: What benefit is there to me keeping my host provider at a monthly cost if Weebly is free (and I end up using Weebly either way)? There must be features/benefits I am not thinking of if my current provider is offering their services. Thanks for the help.