It's a benefit for anyone that has lowered their car from stock. Being able to lower the car and retain a similar amount of suspension travel makes a huge difference in ride quality and handling. I drive in the same general area as you, and even with 1.12" torsion bars I still use ALL of the suspension travel I have, which is pretty much the same amount as what a factory car has because of the QA1 LCA's I run. Reducing the travel would mean even larger bars than that to prevent bottoming out.
The problem with the article is that while Ehrenberg did a good job of measuring the suspension travel, he didn't consider at all the tire clearance to the inner fender. The additional travel from the 73/74 B body LCA's is pretty much meaningless if you run factory inner fenders and a tire more than 25.5" tall, because even with the QA1 LCA's that combo means the tire will kiss the inner fender at full compression. To make use of more travel than the QA1's provide you'd need to raise the inner fenders. Or run really short tires.
And then of course at some point you're going to put the headers on the ground. With the B-body LCA's if you truly used all the travel they can provide you'd be very close to bottoming the headers out too.