No..... it's by far the most important. The creator making the thing in the first place is most important to that things existence. If you do not have that person then you don't have the content of that art or the feelings generated from it.
Necassary
Required to be done, achieved, or present; needed; essential.
The creator is the most needed part because without the creator the art does not exist. The feelings come from the artist, other may interpret those feelings put into the art differently but there would be nothing to interpret without the artist.
Nonsense. As I made an example of earlier, nobody knows who came up with the Epic of Gilgamesh. Museums are littered with statues, architecture, and art pieces whose authorship is unknown or suspect. Would they exist without a creator? No. They also wouldn't exist without marble, bronze, fabric, paint. And ultimately, even authorship and materials do not imbue an object with
value. What's a novel without themes, characterization, and feeling? What is a painting without passion and awe? Objects become art when their contents inspire feelings. That is the essence of art, and is what allows it to endure through ages, speaking to us as it spoke to its own people 10,000 years ago. That is what the human experience means. The only value lost when knowledge of an art piece's creator is lost is monetary. Yet the destruction of the art piece's material and message results in the loss of its value to the human experience.
The exception is hentai, which is created with negative value to the human experience. Therefore, the value of the human experience goes up as hentai is banned and destroyed.