[Qt-qml] qml and real c++ application : QabstractItemModel ?

[qt next]

Hi,

I am trying to create a new application that use qml for interface (to
visualize and edit datas). I understand how to use qml with some simple
model (list, ...) : but in the real life, is it better to use one complex
QAbstractItemModel that acces all the data of my application (with complex
tree ...) or to have a lot of qabstractitemmodel simpler (list, ...), or to
not use at all qabstractItemModel  ? is there any feedback from people that
use now QML in the true life (not a simple contact list ,...) ?
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