Our users keep asking "why Metabase doesn't have a color-picker" and I don't know what to tell them. It seems such a trivial functionality.
Given that colors are needed for x-rays and drill-down, then Metabase would need to maintain a palette of nice colors to automatically assign.
But I don't see why letting users pick their desired color on visualizations would conflict with x-rays or drill-downs. Can you elaborate?