As someone who writes plugins for our Wordpress-based 'headless' CMS for our authors to use (the front-end is all Angular 9+), the biggest gripes I found with the Gutenberg blocks editor was the need to learn some React to build the admin UI elements.

For personal projects, I now build most of the 'admin' in Angular too.

The introduction of Wordpress JSON and the REST API changed everything for me (and the small team), to allow more separation of concerns between the front and back ends.