Re: [whatwg/dom] MutationObserver needs an equivalent of disconnected & connected callbacks (#533)

IIRC this was discussed around the time when MutationObserver was designed and the idea was that since one can add childList observer to the document and then just check document.contains(node), that should in principle be enough (and the things to observe was kept in minimum).
However Shadow DOM wasn't really a thing at that time, and that may have changed the needs.
Concrete use cases, which can't be solved with Custom Elements, would be indeed nice.
The more we add APIs, the more complicated platform we have to maintain and adding more and more API tends to slow down implementations, or at least makes it harder to optimize them.

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