Design always has a purpose.
Great design is serious, not solemn
Marketing is not inherently bad. That's just dumb. That's said by somebody that isn't doing enough work.
Design really can be anything.
It took me a few seconds to draw it, but it took me 34 years to learn how to draw it in a few seconds.
Design always has a purpose, art has no purpose. That's really the difference between them. Do I think one is better than the other? Absolutely not. I think they both fulfill functions.