Alyssa - I didn't say there was anything wrong with using rooting hormone powder. It certainly does no harm, so go ahead and use it if that is your preference. My only point is that it is not likely to make much difference. Sometimes people use something like this and then think everything will be okay and fail to attend to more important things like soil moisture. I understand the appeal because we all like easier solutions.
For some folks, the cost or availability or rooting hormone is an issue and they should know that they can have rooting success without it.
I won't go into detail here, but horticultural practices in a commercial setting are very different than in a home. What works well in a greenhouse, nursery or on a farm is not always appropriate for the lay person.