Why do people use help dogs?

I am only going to speak for myself.
I have some dogs I call help dogs, they don't hunt as hard as my other dogs. They are usually stay closer and usually the rougher of my dogs. I call them help dogs, because I expect them to go help, not that the better dogs need help but I want them to have help, fresher dog, that will honor the dogs bay when others dogs may all be split on their own hogs.
I don't wan't my dogs all split in 4 different directions but if they do my "not so independent" help dog will honor, rather than trying to run its own hog.
You can call mine culls if you want but if I thought they were culls then they would be culled.
My help dogs can and do find their own, but not as high a chance when I have some of my others on the ground.
So each to his own.