And one final suggestion before I forget (note sure where else to post this!) but it'd be cool to be able to have privacy settings on reports, and be able to share them even if the Meltano instance has authentication enabled. If I could make a chart public and then paste it on a webpage, that'd be really useful

That's actually supported already! There are no explicit privacy settings, but when you share or embed a report, it will already be "publicly accessible and read-only", as stated in the "Share" modal: https://meltano.com/docs/analysis.html#share-reports-and-dashboards