If you work in a large company where you need to maintain Design Systems and you frequently collaborate across teams (think different OSes), Figma would be more helpful for everyone. Especially because it has specific features to make that work good.
While if you're a lone designer doing design for physical products, you're probably better off with battle-tested Illustrator that has a lot more functionality around manipulating vectors.
In the end, it all depends on what you're doing. They have different use cases they want to cater to the best.
Sketch, Figma, and XD all make it quick to do the most basic prototyping: click hot spot to go to a different screen. They are much more focused on visual design than prototyping.