As Don Norman — known for coining the term “UX” — said it best, “The real problem with the interface is that it is an interface. Interfaces get in the way. I don’t want to focus my energies on an interface. I want to focus on the job.”
As a designer I am always prepared to be wrong. In testing, you win some and you lose some. That’s just how it goes. I’ve seen “crackpot” ideas win and “best practice” ideas lose. No one is right all the time. That’s what keeps things interesting. But more important than that, being willing to be wrong means you’re open to learning new things. And the way I see it, continual learning is a good thing.