You can find different ways of working with any system.
The attraction of asymmetric tilts is that you can focus at the tilt/swing axis on the groundglass, tilt/swing the rear standard, and whatever is in focus at the axis will remain in focus while you tilt to find your second focus point. And then if you want the tilt on the front standard rather than the rear standard, you read the tilt angle using the scales or a separate device, and then apply the opposite tilt/swing to the front standard, and reset the rear standard to the neutral position, adjusting focus and composition using rise/fall/shift as necessary.
For tabletop work, this is attractive, because the DOF is short and you might have a lot to get in focus, so cameras that have this feature tend to be studio cameras like the Sinar P and Linhof Kardan Master GTL, which have geared movements and scales. I know Ebony has asymmetric tilts and swings as well, but do they have scales? Without scales, you would need a device like a clinometer-compass to measure the tilt and swing angles to transfer movements from the rear to the front standard.
In distant landscapes, it's not usually such an important feature, since the tilts and swings tend to be fairly slight. For architecture, where you're using rise/fall/shift more than tilts and swings, except for indirect rise/fall/shift, asymmetric tilts aren't so useful.