Selection for a global championship is a national decision, and countries make it in opposite ways. The method determines when an athlete must peak and what a bad day costs him.
Trials selection is a one-day test
Where a country selects on placing at a national championship, the qualifying places go to the top finishers, subject to holding the entry standard.
The rule is transparent and difficult to dispute, since everyone knows the criterion before the race and the result settles it immediately.
The cost is that form on one afternoon overrides a season of evidence, and athletes in deep events can be eliminated while ranked among the world's best.
Discretionary selection weighs the season
Other federations select by panel, considering season-best performances, head-to-head results, championship experience and medal prospects.
This produces teams that better reflect who is actually likely to perform at the championship, particularly where an athlete was injured during the domestic season.
It also creates appeals, disputes and the perception of favoritism, because a judgment cannot be verified the way a finishing position can.
The method changes how a season is planned
An athlete facing trials must peak twice, once for selection and again weeks later for the championship, which is a difficult double for any event.
Under discretionary selection, an athlete can build steadily toward the championship and treat domestic races as preparation rather than as the decisive test.
Coaches therefore design entirely different annual plans depending on nationality, even for athletes training in the same group at the same venue.
Depth is what makes the difference bite
In events where a country holds several of the world's strongest athletes, the trials race can be harder than the championship final itself.
Countries with one or two contenders face no such contest, and their selection method barely matters because the outcome is not in doubt.
The American system's severity is therefore a consequence of depth rather than of ideology, and it is defended precisely because depth makes fairness contested.
Neither system removes the underlying scarcity
Entry limits per country are set internationally, so any selection method is rationing a fixed number of places among a larger group of qualified athletes.
Changing the method redistributes who misses out; it does not increase how many go, which is decided by the sport's universality rules.
Arguments about trials are therefore really arguments about which kind of unfairness a country prefers to live with.


