DexterOS 2.2.2: Same in Bloxter and Python. Steer(x,y) is same as steer(100,100) unless x or y is 25(%) or lower. Tried it on 3 GoPiGo3s and same thing.
Maybe obvious, but the steer(x,y) command actually turns on the motors. I thought that it would just set the speed. No.