Re: [WICG/webcomponents] Options for controlling specifics of "slotchange" events? (#933)

> While I don't think an event-based approach to this problem will be entertained due to performance reasons, it doesn't seem difficult to polyfill this behavior.


I don't understand why we think performance is an issue with events. If there are events attached, DOM change events can be handled synchronously, and that machinery can be enabled _only if_ an event listener is added. Secondly deferring or batching event handling off of the synchronous events is literally no more difficult than using something like `MutationObserver`. `MutationObserver` has a worse developer experience than someone simply deferring their updates manually.

Furthermore, it would be simple to add an event option like `{deferred: true}`, and the developer experience would be yet even better.

I think we can make the web both easier to work with, and have performant options.

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