That used to be the case. Intel's caught up. Look at the ASUS UX301LA for example. It's extremely thin and light, with 8 hour battery life and a 2560x1440 screen. Those attributes together wouldn't be possible with discrete graphics, yet the Intel Iris integrated GPU that comes with its i7-4558U is more capable than a discrete Radeon Mobility of 2-3 years ago. It can run mid-level games like Diablo/Starcraft at native resolution (which is very high) and high quality easily, and probably anything released in 2014 smoothly if you just chop the resolution in half (1280x720 not being bad at all).
