I forwarded this post today to my collegues, what is high over the things missing in the new backoffice compared to 13: Blocklist label in V15 - #9 by jacob.
Personally, I’m currently porting over a number of packages from Umbraco 13 to 15 and my major pain point is the missing notifications (SendingXNotifications) in the backoffice. For most other things, I personally think Umbraco 15 is already quit good, especially with 15.2. When TipTap is on par with TinyMCE (should be done before Umbraco 16), that’s also very nice!