Our SL, XC and ROAD Disc wheelsets base on the asymmetric rim construction. The spoke tension on both sides are similar.
Asymmetric rims with offset spoke holes allow for better triangulation of spoke angles and balance of tensions in a wheel build, resulting in a stronger, stiffer (laterally due to proportionately more lateral tension), more compliant (radially due to proportionately less radial tension), and more reliable wheel.
This slight redesign in how we produce rims could potentially have delayed the introduction of Boost rear hubs because the spoke angles would be relatively balanced (compare 70:100% to 56:100%), and 29er wheels would not suffer from lack of stiffness.
Boost and Asymmetric rims can co-exist. As wheel builders will probably know, neither option fully remedies the issue of imbalanced spoke tensions in wheel builds. But if used together, we can all enjoy wheels that are just as strong and stiff, while being significantly lighter (subjective) through the use of less spokes and lighter rims.