Where is your evidence? As related counter-evidence, the leaderboard (to "automatically segment texts and classify argumentative and rhetorical elements in ess

Where is your evidence? As related counter-evidence, the leaderboard (to "automatically segment texts and classify argumentative and rhetorical elements in essays written by 6th-12th grade students") at https://www.kaggle.com/competitions/feedback-prize-2021/leaderboard https://www.kaggle.com/competitions/feedback-prize-2021/lead... shows the score for the best team entrant is 0.753. Why isn't that very close to 1.0?