On the other hand, not sure when it was first reported, but probably at least two years ago – I remember filing a bug related to this issue well before this Oct 2011 post:

http://forums.omnigroup.com/showthread.php?t=22469

A version number would seem like quite a good mile-stone for sorting this kind of defect out.

Even the MS Office SmartArt has no problem with converting text outlines to nested diagrams in which parents are centred over child ranges. It has been doing that happily for years.