The 'Reusable Blocks Extended' plugin advances the potential of WordPress's base feature of Reusable Blocks. At its core, the plugin serves to simplify the process of using and managing these blocks by creating an improved interface. By suppleness, we refer to an interface equipped with an enriched list view, a quick block inserter, a standalone admin menu, and comprehensive previews of what each block would look like once published.

Starting with the enriched list, the plugin offers a single-page view where users can see all their reusable blocks, adding a sense of ease to navigation. The viewing experience is made even more convenient with the presence of a search bar, where users can quickly access a specific block according to their needs. This feature proves quite useful in scenarios where a high number of blocks is involved, saving the user considerable time.

The quick block inserter is another noteworthy feature of the 'Reusable Blocks Extended' plugin. Rather than using the tedious and often elongated block library route, users can directly add blocks to their post or page drafts from the writing interface as the plugin makes this feature readily accessible. The plugin also includes the ability to prevent certain blocks from being directly inserted, providing an added layer of flexibility and customization.

Furthermore, the standalone admin menu allows users to bring Reusable Blocks onto the main dashboard and gives easy, direct access to this feature. Finally, the previews offered by the plugin permit users to check each reusable block's appearance once published. This preview insight before publishing the block helps avoid any potential publishing mishaps, making editing and decision-making faster.