We are sorry to hear you find the Yoast notifications annoying.
Yoast SEO plugin displays a limited set of notifications in the WordPress dashboard. The aim of these notifications is to help you identify issues affecting your website’s SEO and maintenance. For example, if you’re blocking search engines from indexing your website, Yoast SEO will warn you about this as this is a critical issue to your SEO. The notifications that appear under SEO > General can be hidden individually by clicking on the crossed-out eye icon that appears next to the notification.
These types of notifications shouldn’t prevent you from using the plugin normally, although we understand you’d like them to not appear in the backend.