That info from your gunsmith was code for he doesn't want to do fluting. Done correctly fluting doesn't induce stress. If you are really worried about it have it stress relieved after fluting. All barrels are fluted after they are bored and rifled or hammered out. Nobody contours and flutes a barrel then bores and rifles it. You need a new gunsmith Justin.
I probably explained it wrong or put it in the wrong order but I'll stick with what he says. He already built one rifle for me which shoots sub .25 MOA.
Also, why would a smith tell you to order the barrel pre fluted instead of charging for the extra machining?