Re: [WICG/webcomponents] The MountObserver api, an alternative lazy custom element definition proposal (#896)

I love this proposal. 

Potentially dumb question. 

Why not just have the `on` property take either a selector string, or a plain function that returns a boolean? For all the other use cases like media query, instanceof and the like could be static methods on the `MountObserver` class if really needed. like so:

```js 
const observer = new MountObserver({
   on: MountObserver.whereInstanceOf(MyCustomElement),
   import: './my-element.js',
   do: {
      mount: ({localName}, {module}) => {
      // ....
      }
   }
});
observer.observe(document);

```

Also, why have a specific `import` property, when that could be handled by the mount function? 


Thanks.


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