That "attitude adjustment" argument for the heavy barrel keeps getting repeated, but you can never find anyone who can actually confirm it. Old cops I've talked to universally declare it nonsense.... they claim they'd never hit anyone with the barrel and always used the butt of the gun for such purposes ....

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And when large departments like NYPD switched from the standard barrel to the HB model, very likely without polling their officers first, I doubt very much that even back in those pre-sensitivity days the arguments contained anything about "being able to whack people over the head without bending the front sight".
While the perceived recoil benefit of the extra few ounces up front is a matter of eternal debate (it's a matter of simple physics, so anyone claiming not to notice it speaks purely for himself), S&W likely sold the cheaper-to-produce gun as a sturdier and longer-lasting version for the same price as the standard barrel.