Oddly, I was reading this article (or a similar, can't remember exact source) a few days ago about Biles is SO good they have downgraded some of her scoring. They downgraded the scores because they were scared other gymnasts would hurt themselves, possibly severely (landing on neck), because they would try and keep up but did not possess the physical ability to do so.
Ledecky and her are in a different world when compared to their counterparts. As a non gymnastics person it is probably harder to appreciate how much better Biles is, whereas Ledecky you can see her finish world championship / olympic finals without even second place on the screen. She touches the wall, paddles around for a few minutes, gets out, showers, has breakfast, and then the next person touches the wall.
https://www.usatoday.com/story/sports/columnist/nancy-armour/2019/10/04/gymnastics-simon-biles-penalized-championships-being-too-good/3866255002/