When a child falls over the harness with its front and back grab handles allows for ease of picking the child up and dropping them back onto their feet. They do need to learn to get up themselves but with a stumbling toddler you often want to just get them up to carry on!
https://youtu.be/iJGfWXuVDKI
https://youtu.be/g8fGSk3zPeo
https://youtu.be/bQBwYKs-_rI