Correct. The counterweights on inline six are there to reduce crankshaft bending loads only. v8 cranks are different story. v8 counterweights reduce crankshaft bending loads but also make a tradeoff of the unbalanced force directions. Inline six does not have the unbalanced forces.
For a great case in point of these unbalanced forces in action go find a 1960's GMC V-6 or early Buick V-6. Nothing like odd fire engines!
