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It is not helping them to retrieve, it is teaching them to pay attention to you the leader/master/alpha dog. if they won't listen to you on lead they SURE won't listen to you off lead to retrieve something. The OP mentioned the lagging, this is because the dog is not LISTENING to them and "watching" for the next instruction. If they don't have their head wrapped around the idea they are working, they will not do a dern thing for you when it is important.
There was 2 parts to my post one for lagging and one for retrieving. Shock collars have their place, I just don't care for them personal opinion, just like different flavors of soda pop. My daughter's 4-H dog leader states it to them this way. the regular collar is on when they are not "working" and relaxing just being a dog, when the slip chain collar goes on we are in "work mode" they need to be on their super best behavior and pay attention more than with a regular collar. I have noticed that after they get them trained on the slip collar, they also work the same with a regular collar. You as a master do not have control with a regular collar, there is no way of correction. With a slip chain collar, they hear the ripping of the collar(don't have to necessarily FEEL the rip) hearing is enough.
But you will get a hundred and one ideas on training and generally most of them work, it is a preference and which one do you want to try out. Keep trying until one works for you.