Hi Tommy,
for purpose of reporting database views are not an alternative to HANA views. There is no visual Modeling Tool for database views creation and it is difficult to re-use them in the same manner as you do with calculation views. Besides of, in contrast with calculation views there are no:
1) database views optimization at the time of execution, for example, removing unnecessary joins;
2) database views additional metadata generation for MDX clients such as Analysis for Office and Lumira.
Hope it will help.
Regards, Uladzislau