Qualifying formats change more often than almost any other part of motorsport regulation. Each version solves the previous one's weakness and introduces a new one, which is why the cycle repeats.
What qualifying has to achieve
The primary purpose is to order the grid by speed, which requires every competitor to have a fair opportunity in comparable conditions.
The secondary purpose is to fill a session with watchable activity, since qualifying is sold as a standalone event to broadcasters and spectators.
These aims conflict. Accuracy favours giving everyone maximum track time, while watchability favours concentrating the meaningful laps into a short window.
The open session and its flaw
A single long session with unlimited laps is the most accurate format, since every driver can respond to improving conditions.
In practice teams calculate the optimum moment and all appear in the final minutes, leaving the session empty for most of its length.
Traffic then becomes decisive, because a car encountering a slower one on its fast lap loses more time than any setup difference would explain.
Single-lap formats
Running cars one at a time removes traffic entirely and guarantees continuous action, which is why the format has been tried repeatedly.
It fails on fairness, since track conditions evolve as rubber is laid down. Running order becomes a substantial advantage unrelated to speed.
Weather makes it worse. A shower during the session can eliminate a group of competitors through scheduling rather than performance, and no reordering after the fact can repair the result.
Elimination rounds
Splitting qualifying into segments that progressively remove the slowest cars concentrates the strongest competitors into the final phase.
It also gives each segment a deadline, which forces activity throughout rather than only at the end, addressing the empty-session problem.
The weakness is that a strong car eliminated early through a mistake or traffic has no route back, so the grid can misrepresent relative pace. Tyre allocation compounds this, since sets used in early segments are unavailable later.
Why no format settles
Every version is judged against the last, and the failure mode of the current format is always more visible than the failure mode of the one before.
Commercial pressure adds instability, since a format that produces predictable results is criticised regardless of how accurately it measures speed. A grid that reflects the true order is exactly the grid that promises the least overtaking.
The underlying trade cannot be resolved, so the sport rotates between positions on it rather than arriving at a settled answer.
