Your Plumber took the 'hot, fast and cheap' route. You will find exposed piping in many buildings; they usually just paint them to match their background and its not such a big deal.
The next time you go out to eat, look up at the ceiling. You'll probably see the roof trusses, heat and air ducts, sprinkler system and maybe some other pipes, all painted black and completely unnoticed unless you look for them.
I'm sure your Plumber would be willing to come back and re-run the pipe in the slab but, would you be willing to pay for it, suffer the dust and noise?