More knowledge means more neural connectivity, which means a greater level of creativity (as long as you also develop critical thought at the same pace.)
For art, you need creativity. People tell artists that "the best way to paint/write/draw/act/sculpt better is to go out and experience the world." Well, in the same way a degree in the sciences offers a good topical coverage of the knowledge the world has to offer, a liberal arts degree offers a pretty good topical coverage of the experiences the world has to offer, so you can decide what to dig into. They're useful from that perspective.
For art, you need creativity. People tell artists that "the best way to paint/write/draw/act/sculpt better is to go out and experience the world." Well, in the same way a degree in the sciences offers a good topical coverage of the knowledge the world has to offer, a liberal arts degree offers a pretty good topical coverage of the experiences the world has to offer, so you can decide what to dig into. They're useful from that perspective.