Firstly, writing “rules” need to be rebranded as “advice.” advice you can choose to accept or ignore. Second, instead of “showing is good, telling is bad” it would be more useful for authors to know when to show and when to tell.
In very simple terms, showing allows readers to experience the story along with your characters rather than observing them. Telling summarizes and instead of allowing the reader to form their own decisions.
Showing gets your reader involved in the story and evokes emotion. Telling creates distance between the reader from the events and characters in the story. Both are excellent ways to tell a story! But they must be used with intention!