The Classic Editor plugin will be officially supported until December 31, 2021 and yet there are many plugins that make extensive use of meta fields such as WooCommerce or all event listing plugins that are still using the classic editor UI. Two years have passed since WordPress 5.0 was released and still there is not an adequate way to replicate a big panel with many meta fields in Gutenberg. I know that the PluginDocumentSettingPanel and PluginSidebar components exist, but they are too narrow and are not suitable for custom post types that use meta fields heavily. Can someone in the Gutenberg team take a look at this and offer us a solution, please?