3D cad is a tool, like any other tool. It helps me make things I need to make. If you don't need 3D cad, it might be a tool you just don't need. I don't shoe horses, so don't need a farriers anvil and forge...and they probably don't need 3D cad.
The problem is what cad has become. Compare what cad is now to a #2 bastard file. In one month my file will still be where I left it, it will be the same size, shape, color, and the handle will be in the same place. And in a decade when it's worn out, I can buy an exact replacement. Next month the whole cad system will look, feel, and operate differently. In 10 years I won't even be allowed to touch it without paying for it again.
And it's not necessarily the cost of CAD. If it's making me money or saving me time that's worth something. It's the time lost relearning something I already knew how to do. The irritating part is these companies want me to pay for the privilege of relearning something that they changed.