Hey Mohammed,
Please refer one of the existing thread where this issue was discussed:-
http://scn.sap.com/thread/3775286
About your query, the idea of having aggregates and index was for faster reporting.
But with Hana you can have aggregates very quickly,
So all the old tables ( as mentioned by you) are replaced by view, which will not have data footprint and will collate data on the Fly when referred.
Hope this helps,
Please close the thread.
Regards,
Rishab