You cannot separate the entertainment from the cultural code that runs beneath it.
Unlike Hollywood, where "Actor" and "Musician" are distinct professions, Japan operates on a "Talent System." You cannot separate the entertainment from the cultural
Japan has a unique ability to take foreign concepts and "localize" them into something unrecognizable. KFC for Christmas, St. Valentine’s Day for women giving chocolate, and Western fantasy lovingly rendered in Dragon Quest. In entertainment, this manifests as the Yankee subgenre (Japanese delinquents inspired by 1950s American greasers) or the "Hollywood remake" that Japan almost always rejects (e.g., the disastrous American Ghost in the Shell vs. the original anime). an Idol is a specific product.
In the West, an idol is a star. In Japan, an Idol is a specific product. You cannot separate the entertainment from the cultural