No, you don't need them. And, I think training is a journey. And the reward is not a passed trial or a blue ribbon, but a dog that can reliably follow commands after years of not training them. The reward is a bond between the dog and the owner. I don't like taking shortcuts to get from here to there, because the process is its own reward and the cementing of the behavior.
And I personally feel that we are asking a critter to do what the human wants to live with humans in a way appropriate to a human's lifestyle, or to work with humans. This shouldn't be done by a fear of a correction -- dogs do not like being shocked. Neither do I. An electric wire -- electric fence that the dog can see, he learns that it isn't pleasant to touch that and he won't. That at least is fair. The dog learns the boundary, can see it, and can avoid it if he chooses. An e-collar is on their neck and they cannot avoid shocks unless they figure out what you want and what you don't want. And then, they do it to avoid unpleasantness, instead of doing what you do want because you know how to motivate the dog.
Yeah, I really don't like prong collars either. I don't like and won't use either. My choice. I will not support a ban of either. I just see them as unnecessary, and in some cases counter-productive.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.