Fashion design is the art of application of design and aesthetics.  Something that's important to many people.
Oh yes, it's very important. I enjoy the work product, but not the process.
Yes, it's a tough process.  The designers must conduct research on fashion trends and interpret them.
I would imagine. Do they have to sew at all?
Some do sew, all while attempting to design clothes which are functional and pleasing to the eye.