Some of the rules which are provided to style the HTML elements which are only used for editor functionality override the usual CSS cascade. This forces Theme/Block authors to write more complicated CSS than is necessary.

An example is .wp-block-cover .block-editor-block-list__block {color: #f8f9f9;}. This is a specific colour assignment to an element which is only in the editor. However, this means that all children of .block-editor-block-list__block will inherit this colour. The much simpler CSS standard colour inheritance - which allows me to set the text colour on the outer .wp-block-cover and have it inherit down the tree - is broken.