You are misrepresenting those definitions a bit. Or they are poorly written. Showrunner is a thing, TV projects have them. They are the 'nexus' - both creative

You are misrepresenting those definitions a bit. Or they are poorly written. Showrunner is a thing, TV projects have them. They are the 'nexus' - both creative and a bit operational of the show. Like the 'founder' and 'visionary' of the show. They also kind of 'make the show happen'. Dan Levy is the 'Showrunner' for Schitt's Creek. Just type the name of your favorite TV show along with 'showrunner' and you'll see who it is. Usually will be 'creator' and 'writer'. They will probably get a producer credit. Note that 'showrunner' is generally not a specific kind of 'credit' but that a feature 'credit' isn't really a title either. 'Exec. Producer' can mean anything. Or nothing. The 'director' in TV is generally less important. For film, usually the Director kind of plays that role as the lead visionary, especially if they pitched and raised the money, got the team together, got the actors to sign up etc.. Producers are generally not directly creative visionaries.