By no-brainer do you mean everyone in the gym and even the concession stand in the hallway agrees on a call? If that is what you mean then there very rarely are no-brainer calls.

I've had a player control foul where the defender established defensive position, backed up, stopped, and took the charge. The coach didn't agree with me on that no-brainer.

Or perhaps you mean the slamming the ball in frustration Technical foul - That usually almost everyone agrees with.

Have you tried reffing yourself? Have you written the test? Have you always been in the perfect position on every play?

Maybe give reffing a little shot. See what it is like. See what it takes... perhaps that will give you a different perspective on coaching.