There's no way to do anything on a touch-screen without taking one's eyes off the road. With iDrive, one can at least execute learned actions using the controller without looking at the screen. This minimizes the amount of time that the driver needs to remove his/her eyes from the road.
Delivered! --> '15 F33 328xi, 8SA, Glacier Silver with Coral, 403M-19", ZMM, ZPP, ZTP, ZDA, ZDB, ZCW, ZDH, 4M5
Past --> '13 F30 328i, 8SA, EBII, ZMM, ZPP, ZTP, ZLP, ZDA, ZCW, ZDH, BMS Stage 1
Past ------> '08 E92 335xi, 6MT, DGM w SDL, ZPP, ZTP, ZLP