And it’s sadly just not needed. Not using R+ is not cruel. Why is that so hard for people to understand? There is a best training method for everything. Sometimes R+ is the best. Lots of times it is not.
How to teach my nuisance barker NOT to bark? You can’t do it with R+, that’s for sure. As you say - it’s distracting him from doing it. So yes, maybe he barks because he’s bored. And if he’s tired he’s less likely to bark. But that is not training; it’s changing the environment/routine. (This is a real scenario. I have had 6 of the same breed over the years and all get lots of exercise - and only my youngest is a barker.) A bark collar works REALLY well.
I have a friend that taught his dog to heel with a shock collar. (This was in a hunting dog group and for a competitive event where off leash heeling was required.) The dog already understood how to interpret a shock collar as R- from other experiences. This guy taught the dog to heel with 2-3 sessions. Most people in basic obedience (and likely some on this thread) would disapprove. Because you can teach a dog to heel with R+. But why is that the only acceptable method?
(Also need to remind people that just because a shock/training collar CAN deliver a painful shock, it doesn’t have to. How is this different than teaching a horse to move laterally with leg pressure and/or a tap from a crop or spur?)