Help to decide the direction of Config Split
Config Split has worked mostly the same way as it did when the first beta release was tagged in 2016. The 8.x-1.x branch is using Config Filter as the API to hook into the configuration management of Drupal. But since Drupal 8.8 we have a much better API in Drupal core which allows us to do more complex things with simpler code than the Config Filter API did. The core API was designed with the lessons learned from Config Filter in mind after all.