It doesn't. If you can't provide an adequate user experience free of large input delays, you should have never installed a touchscreen in the first place. Infotainment systems have gotten less bad, but I haven't seen notable advancement in reducing time spent with eyes off of the road the way a physical button or knob does.
They install touchscreens because they think people want them. The cars sell, because the only choice is touchscreens, and their decisions are validated. Rinse and repeat.