Wanting the child to do something is one reason. Concrete needs another. You wouldn't disagree that I'd need to call back a small child from a high traffic street or a cliff or a dangerous animal or a poisonous thing. These are immediate and obvious.

But there are still parents who handle those occasions just fine without resorting to punishments and rewards. My parents never seriously resorted to modeling my behavior though behavorism.

It may be that you lack a relationship with your kids where that's possible. Especially if you already have rules that get enforced through punishments and rewards the kid will rightly assume that a new rule that isn't enforced that way isn't serious and the don't have to follow.

I think it's very hard to talk about something like parenting because different parents have success with different strategies and most think that their own experience should be guiding for all. It's like politics in it's mind killing potential.