Rich text for text/multi-line text field types - In your text fields I cannot use basic text editing attributes like bold, underline, bullets, numbering and hyperlinks. This is super important for feature description that usually contain high level requirements or pointers to external docs.

Multi-select list field type - When I'm building my roadmap, I sometimes need pre-defined lists of customers/components/teams/etc. to choose from, when multiple values are crucial (let's say my feature is needed by several customers or impact several components in the product).