Difficulty of Art

I believe that there is sometimes a stigma that art is easy.  While some artwork is "easy" to create (lacking skill), not all art is "easy".
Then, to the person who enjoys art, is art "easy"?  To the francophone, is French "easy"?  To the science-lover, is science "easy"?  Certain art (or areas in French or science) can seem easier to do for some people, and certain areas are very difficult.
In my experience with art and biology, both subjects that I enjoy, to me, both subjects are difficult.  Maybe, art is usually harder because there is no limit.  Contrasting, biology has a limit; there is a quantitative point (can be measured using numbers) to be reached, so it is clearly understood what the goal is.  But, art generally doesn't have this limit, so I find it difficult to know what the goal is, because the goal is ever higher.
Ultimately, art can be "easy", but I would not find enjoyment or respect with this, so art is difficult for me.