When timing systems became precise enough to display tenths of a second, basketball inherited a problem: some remaining times are too short for certain actions to be possible.
Precision created the question
A clock showing whole seconds hid the issue. Once tenths were displayed and reviewable, a catch and shoot attempt with a fraction remaining had to be adjudicated.
The question is not whether the ball left the hand before zero. It is whether the sequence the player performed could have occurred in the time available.
That is a question about human movement rather than about the clock, which is why measurement alone could not settle it.
The rule defines what is possible
Basketball's answer was to specify a minimum time required to catch and shoot, below which only a tip or a direct deflection can score.
The threshold was set from observation of how quickly the action can physically be completed, and it functions as a bright line rather than a case-by-case judgment.
Above the threshold, a catch and shoot is allowed and reviewed on the video evidence. Below it, the attempt is disallowed regardless of what the video appears to show.
Why a bright line beat case-by-case review
Reviewing each instance individually would require officials to judge whether a particular player could have completed a particular motion, which is unanswerable consistently.
A fixed threshold produces the same outcome in the same situation everywhere, which is the property a rule needs even when the threshold itself is approximate.
The cost is that a genuinely completed shot just below the threshold is disallowed. Rules of this kind trade accuracy at the margin for consistency overall.
Review procedure follows from it
Officials reviewing a last-second attempt establish the clock reading when the ball was touched and when it was released, using synchronized video.
The two readings determine which rule applies, so the review is a measurement followed by a lookup rather than an act of judgment.
Making it mechanical is the design goal. A late-game review that turned on opinion would produce exactly the disputes the rule exists to prevent.
The general pattern
Better measurement does not automatically resolve disputes; it frequently surfaces questions that the previous imprecision had concealed.
Each of those questions requires a rule, and the rule usually encodes an assumption about physical limits rather than an appeal to the measurement.
Sports adopting precise timing consistently discover this, which is why timing rules grow more detailed as clocks get better rather than simpler.

