Let's do keep this simple.
If used properly, rooting hormones will help a plant develop more root mass in less time than without it.
I've tried both in several types of conditions many times throughout the years.
The best gadget I've ever owned is my rooting machine. I fill it with water, add the proper amount of rooting hormone to it, put the cuttings into some hydroton filled net cups and drop them into the machine for 14 days.
When I take the lid off, 14 days later, all the cuttings have roots about a foot long hanging into the water. Lots of roots. I sometimes have to use a razor to cut them apart.
I've never seen this dramatic of an example of fast and profuse rooting in any other form of rooting methods.
Is rooting hormone necessary? No.
Is rooting hormone a good thing to use if you want really profuse, healthy, and massive amounts of roots to show in 14 days? Yes.
It's no big deal. The stuff is cheap. It works.
I see no issue here.