Hey @Stephen_D 
- you’re right that using the deprecated Polaris Viz package might cause versioning conflicts, but it wouldn’t automatically disqualify your app from being published on the Shopify App Store.
That said though, we generally recommend using up-to-date Polaris libraries for better long-term maintainability and support (as well as following our design guidelines).
For data visualization in app though you could leverage our Remix-based embedded app approach to implement an embedded app within the admin, and then build custom visualizations within JS if you’d like to look at that as an option. Could you share more details about what type of data you’re looking to visualize there? Just wanting to confirm what you’re looking to build, since there are some limitations in our API Terms of Service regarding replicating Shopify’s native reports.
Hope this helps and hope to speak soon!