The story is straightforward; Gutenberg is the new editor experience in WordPress, which is going to be merged into core in the next major release. A lot of plugins that do not keep up with this will become obsolete. This makes it essential that you adapt your plugin for Gutenberg before it’s too late.
Are you wondering what the best blocks plugin for WordPress is? This guide to Kadence Blocks vs GenerateBlocks vs Otter is here to help. CodeinWP