Andrey Rublev was kicked out of the Dubai tournament after he lashed out at a linesman. The incident goes beyond the world of tennis, and one can learn a lot from it, says Peter Walla.

Walla: Rublev is known as a hot-tempered, not to mention hot-headed, tennis player who occasionally loses it on the court. The judge is of course not a factor, just background. Its role is to be imperceptible,. not to disturb. Technology hurts his status and makes him redundant.