GPUI Question: Why does cx.new(...) not take the object directly?

[jbirnick]

[This is a pure GPUI question, but I thought it's still best to post it here rather than in zed.]

The cx.new(...) function takes a build_entity closure that should produce the object behind the entity. Why does it not take the object directly?

I.e., currently it works this way:

cx.new(|cx| {
    // placeholder for some code to create `my_obj`
    let my_obj = ...;
    my_obj
});

Why not directly like this:

// placeholder for some code to create `my_obj
let my_obj = ...;
cx.new(my_obj)

I understand that the current version allows me to use the context of the entity that I'm about to create. However, why would I ever need this in the building process of my object? For subscriptions etc. I can also use the context after creating the entity, no?