Interesting. If the problem is just finding the data, why not make the product a way to load data into "your favorite data visualization tool". I'm not really the target customer, but will people really want to use yet another data viz tool (idk).
Amir here. We allow users to download the cleaned data and load it into any visualization tool they want. That being said, we have found a lot of users (especially those who tell stories with data) have a lot of use for having the visualization as part of the same solution.
few other things that users typically want that standard data viz tools don't make easy -- auto-updating data pipelines so that your data viz is never stale, and notifications when the data updates. Not exhaustive by any means, but just some more color.