In my opinion, Weebly's limit is with rich data. It's quite difficult to build structured data into Weebly, and their support team will tell you it's built-in already. I can tell you that it's not. Even when using Weebly product data, many of the structured data fields populate, but it's usually not enough and you have to do some by hand. This generally requires a Weebly developer or SEO consultant for assistance.