Great question. Lots of ways to answer it. I would say:
A. Listen to the wood. Let the wood tell you what kind of bow it wants to be. Every time I ignore this, I get a broken stave in the corner.
B. Beauty is the objective. Make what is beautiful to you and don't let anyone else tell you what that is--whether plain and functional or ornate and impractical, or anything else--but life is too short to settle for ugly when you have beauty inside waiting to come out
C. Enjoy the process. Some bows will break, some will take set, some won't turn out how you hoped, and some will look and work great. But slow down and enjoy the ride no matter what.
The best advice in bowmaking I ever heard was "it's just a stick" -- don't remember who said it.