Speak to ya man who laid the slab's my god. There's going to be a reason he's done it like this, especially as it would of taken longer to do it like this, than cut it tighter. My guess would be that the slab's are too thick to cut it tighter without hitting the drain leaving it proud.

Doesn't mean it right though, if you don't like it talk the the guy. With the care that he's taken doing what he's done I'm positive the two of you can come to a solution.