tele skiing has two benefits when you really break it down, and both of them have to do with the difference of turning.     with tele skis you can get way lower while doing your turn.  the lower you get to the ground, the closer your center of gravity is to the ground, and so the more stable you are.      the other thing is, when you do a tele turn your running length of edge almost doubles during the turn, which really helps as well.
I don't like tele skiing, and in tight situations, don't really like being around tele skiers.   because of the aforementioned benefits I find it takes a lot away from their flow down the fall line.  I find that they have the tendency to make random turns often shooting out in front of me unexpectedly.   I still ski with them, I just keep a wide berth when skiing down on the same slope as them.