Nothing wrong with symmetry, and there are some makers who could custom build a framelock with G10 both sides.
One the other hand, dropping the unneeded extra scale has it's benefits. It's one less part to put labor into, and the the asymmetry has it's own attractiveness. It makes the knife less traditional and more machine like, rather than organic the way traditional styles emphasize.
Strider, Hinderer, ZT, Kershaw, and Boker offer them. Adding to the contrast, a brightly colored G10 scale, and a darker nitrided, flamed, or anodized titanium, aluminum, or steel lock side, with the makers specific machining for the lock and release. You get to see the works working, so to speak, instead of hidden.
Neither is "morally" wrong, just a different way to make a knife, just as a Ducati Monster Dark is different compared to a HD Road King. Some prefer one or the other. Mess with knives long enough, you may catch yourself coming back the other way. I'm disposing of my fat liner locks and keeping the framelocks. Asymmetry has it's advantages.