That's called a no limits fallacy, my friend. He needs physical contact and obviously a good deal of concentration to use that in order to take down someone more powerful than him(like Anakin), as seen when he failed to use it against Krayt.
If he tries touching Anakin with a glowing hand, he'll get his hand sliced off. Anakin's telekinesis provides no such risks and is enough to choke Cade like a b!tch.