As for it being a training tool, a mitre saw is a tool, a hammer is a tool, both can be used to build a house, but you shouldn't use a saw as a hammer
You're right, you need the right tool for the job. This is a collar. Collars get pulled and jerked guiding the dog in training. Just because the collar also holds the receiver doesn't make it not a collar.
I used to use the Sportdog collars to stake out my dogs when we were training remote away from our trucks. One place we walk in is just slightly more than a mile, others less. But even if we have to walk in only 300 or so yards, which is real common up here, I'll take both dogs with me as it saves the time of the walk back to the trucks to get another dog. Now I have to have two collars on the dogs.
If you put another collar, with a tag lead, on a dog, the lead will drift down and be under the dog's neck out of convient reach. If the same tag lead is put on the electric collar the weight of the receiver will keep the tag lead up on top of the dog's neck where you can grab it and use it when you need.
Sportdog didn't tell us the ring was useless and only put on for show. I remember when the rings became available on the Tritronics collars. They were put on to use them. At a Dobbs seminar in 1992, Dobbs told us to add a ring for the use of a lead and they became standard a year or two later.