1) Redispatching event isn't the same as bubbling. Say we have some (third party) component which dispatches event without bubbling. And we want to delegate this event further.
In this case we need redispatch the event.
The metadata tag is used only for code hinting inside the IDE. If you want the event to show up in MXML code hinting of your component, you need to put an event metadata tag.
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