Thanks for sharing this more broadly. Just want to note that I'll follow the comments here and do my best to answer any questions folks have as well.

Ideally, please leave feedback on the post itself so all can benefit but I understand not everyone has an account: https://make.wordpress.org/core/2023/03/14/fyi-navigation-section-of-new-site-editor-experienced-removed-for-6-2-rc-2/

Related to this, I do want to mention that enhancements are still coming to the experience of using the navigation block and managing menus on your site for 6.2! More info in my post here under "Navigation Block: New Editing Options and Better Defaults": https://nomad.blog/2023/03/01/wordpress-6-2-source-of-truth/