It’s just a very dull concept, “Leia sensed the death of her son so she left her Jedi path, but she said that one day someone would come to complete her son’s destiny to die”. It’s so clunky, and it’s an odd thing to introduce near the end of the final film, where there was no previous notion that Leia had any sort of premonition of her son’s fate, she even said “I know my son is gone” in the last film.

That’s why people considered changing it to ‘birth’ to make things simple. But I think it’s a lot more fitting if Leia simply sensed she was not meant to be a Jedi, it fits better with the Leia we see in the previous films. Luke is talking to Rey about the “destiny of a Jedi”, so it’s fitting to juxtapose that with Leia sensing it wasn’t her destiny to be a Jedi.

It makes more sense if the “journey” Rey has to finish is strictly centered on being a Jedi (the center of her character journey and her main struggle in this film). Adding “oh and also Ben will die when you pick up her journey” just muddles things to the point that’s the one thing people take out of that scene. Shifting the focus of Leia’s path solely on ‘being a Jedi’ also fits pretty nicely with the line change to “I’m a Jedi” on Exegol, which would be followed by the sabers “fizzling out”, finishing their journey.