Use layout builder for content add/edit form
https://www.drupal.org/project/drupal/issues/3121372
Use this module as a workaround: https://www.drupal.org/project/layout_builder_widget
Conditional display of blocks
https://www.drupal.org/project/drupal/issues/2916876
Add relationships to layout builder - display fields from referenced entities
https://www.drupal.org/project/drupal/issues/3001188
List of available blocks is overwhelming
https://www.drupal.org/project/drupal/issues/3073648
Larger block forms in sidebar
https://www.drupal.org/project/drupal/issues/2951547
Support third party settings for components within a section
https://www.drupal.org/project/drupal/issues/3015152
Allow layout builder sections to be nested
https://www.drupal.org/project/drupal/issues/3053145
Allow layouts to provide dynamic regions
https://www.drupal.org/project/drupal/issues/3075939
Add visibility control conditions to blocks within Layout Builder
https://www.drupal.org/project/drupal/issues/2916876