It might be easier and cheaper to find an engineer willing to do 3d modeling of the forces on the muzzle end when the bullet passes based on the differing thread types. A while back someone posted an interesting strain model for the gas block area comparing set screw, pinned and clamped types of gas block.
On the other hand, I see no downside to the larger diameter threads, so if a barrel you want is available with them just try it out. If the barrel you want only comes in 1/2x28, there's your answer.
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