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The motivation is that we can't use event.deepPath[0] in either case, isn't it?
Yes, these properties are changed but their original values are not otherwise exposed. (There might also be value in event.deepTarget as a clearer event.deepPath[0], just like event.target is short for a conceptual event.path[0]...)
Also: deepOffsetX/Y
Moved to https://github.com/w3c/webcomponents/issues/76