XD Plugin Development Best Practices guide can be used to ensure that your plugin is functional in a variety of edge cases and provides a good experience to your end users. While it’s not a hard-and-fast requirement that you follow these best practices when submitting your plugin for review to the Plugin Manager, it is highly suggested that you try to follow the guidelines when and where it makes sense. Doing so ensures that your users have a good experience with both your plugin and Adobe XD itself.