Why informed design?
What separates design from fine art is service. Design serves the client, the audience, and at times, society as a whole. Design that doesn't inform is merely window dressing. (And often frustrating window dressing!) The greatest designs inform both factually and emotionally in an effortless, beautiful way.
Why be gleeful?
Cause if it isn't worth doing with enthusiasm and heart, it isn't worth doing at all!