Should components manage their own state or be created when they need to be rendered?

[kit-981]

zi looks great. I hope you don't mind questions :)

I was reading through the todo.rs example and it looks like the state of each item in the list is tracked in a TodoItem struct that TodoMvc holds. From what I can tell, a Todo component for each TodoItem is created each time TodoMvc is rendered. Is there a reason that the state held by TodoItem is not held by Todo with TodoMvc tracking a vector of components rather than a vector of TodoItem structs?

I was thinking that creating Todo components every time the TodoMvc component is rendered would be expensive. I don't have much experience with similar frameworks (like yew) so I'm not sure what the best or common practice is.