Outside light fixture
No. Those "sleek" lights also must mount to a junction box of some kind.   However, their box is installed flush to the wall, by embedding the box in the wall.  Same as any outlet in your home, for instance.   

In this case, either someone installed a wedge spacer box for no conceivable reason, or this junction box is tearing out of the wall and needs to be reinstalled properly or replaced.  If that were done, this light would also look a lot better.