You’re misunderstanding. This isn’t about React, it’s the Radix UI primitives library which is being overcomplicated by it allowing you to put any element as the visual part of the radio button.

As for “the point of React” being that you can just do such and such… there’s nothing special about React there, that’s what any of these component libraries achieve (React, Vue, Svelte, &c., even basic templating systems like Handlebars a lot of the time).