Just to clarify, this argument for symbols is not dependent on modules.
Restated, the comparison is between:
```js
class MyButton extends HTMLElement {
createdCallback() {}
}
```
vs.
```js
class MyButton extends HTMLElement {
[Element.create]() {}
}
```
> We're already doing some crude namespacing with *Callback. I'd expect that as
> soon as the first iteration of Custom Elements is out, people will copy the
> *Callback style in user code.
This is a powerful point that I definitely agree with. I would not be terribly
surprised to find some library on the web already that asks you to create
custom elements but encourages you supply a few more library-specific hooks
with -Callback suffixes.
