with managed i mean that the view is now merely a reflection of state. Basically just like with the dom:

    {condition && <div>hello</div>}

The div is there as long as the condition is true. But of course it can now also be a mesh, or a component that can clean itself up after the unmount.

We did this manually before, which usually meant watching out for objects to remove themselves, they'll have to communicate up their hierarchy to inform parents and so on. This wasn't straight forward in three, so there was a lot of prototype hacking and terrible things like that, i'm so glad this will be all gone.