Plenty of multi-engine airplanes lose an engine and roll right into the ground right after takeoff.....the ability to glide isn't much of a benefit when trying to out-perform assymetrical thrust and drag. And if an airplane loses all power....it may glide...but not for long. It isn't so much the ability to glide that serves as a benefit...but what you can avoid hitting when you come back down. The lower the altitude this happens for any aircraft...the less options they have to choose their point of impact.