Their concern is inconsistent with the way other developmental tasks are handled. Withholding a cane completely from a young child is no more logical than totally withholding the washcloth because she flops it around. At first we place the child's hand on the cane in the proper position. Later she holds the handle correctly when reminded. In time she will remember by herself.
Some beginners are better off using two hands on the cane for awhile.
They may center the handle better, and overcome a tendency to reach out with the free hand. Similarly, very young beginners may find it easier to slide the tip back and forth rather than tapping it. As the child progresses introduce new elements of technique. Avoid waiting unduly long between refinements lest the immature technique become too established. Then the habits to be changed include shuffling feet, outstretched hands, slow motion, irregular gait, and crippling fear.