Skiing is tough enough for beginners. I don't see the use in adding the extra effort, pain, suffering and humiliation of a t bar. The magic carpet is great and even little kids can do it on their own. Even some somewhat capable snowboarders and to a lesser extent skiers have trouble on the t bar.
There's also the goofing off factor. A friend's kid was goofing off on the tbar. He fell off the bar but his goggles which were attached to his helmet got stuck on the bar. I watched helplessly from 100 feet back as his face got dragged across the snow for about 500 feet. When we got near the top the operator stopped the lift and I ran up and carried him another 300 feet to the warming hut. He had blood all over his face and was hyperventilating to the point my wife had to pull his tongue out of his throat. so he could cough up all the blood inside his mouth. We comforted him and got him to calm down until ski patrol checked him out. Turned out fine, no concussion and he was back skiing that afternoon, tough kid!