People who say this dont understand what a UI is. If that was true, then God would not have invented the eye.Flowers wouldnt have color. Trees wouldnt have texture. Jony Ive was great because he kept the window minimalistic.If you kept OS UI elements minimalistic and non skeumorphic, you would end up with Windows 8 Metro. But,Yes I agree there needs to be a trade off.
UI is all about tricking a user into virtual reality.