This is a good question. I'd aways thought the answer was "to blur the lines between editing audio and midi." Well I think that's a great idea but it can't be the answer since the similarity between the two pretty much ends with the shape...
It's frustrating and kind of misleading since I still can't freely edit the tempo of a project that contains midi items and audio items and get anything but a mess. I guess that's a timebase issue, but my point is, the existence of the midi item containers makes me expect i can treat them the same as audio items in the context of an arrangement, and ultimately I can't.
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