@justinfagnani the `childrenChangedCallback` is an easy peasy thing to configure in the `constructor`, if needed, so it's way easier to have and definitively less important than `parsedCallback` / `buildCallback`, IMO.
> `finishedParsingChildrenCallback` doesn't solve the dynamically changing children case.
anything specific to children doesn't solve much, and children are super easy to observe already.
> The platform should provide a reasonable signal for "If I need to process children, when should I do it".
For one-off setup that is exactly what `parsedCallback` / `buildCallback` are being proposed.
For anything else, if needed, we already have MutationObserver, I don't think we should slow down everything with an implicit mutation observer for children in every custom element.
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