As I said above, I have just about every brake set up currently on the market. I regularly switch from a hub mounted disc brake equipped mountain bike to a cantilever equipped road bike. I even have a bike where I can directly compare disc and v-brakes. I just don't experience any changes in the ability to modulate the pressure that I can assert on the brake system. The v-brake (rear brake) isn't any harder or easier to control than the front (hub mounted disc). Nor have I ever found a rim brake to be particularly "grabby".
I am also not new to using hub mounted disc brakes. I've been using them on mountain bikes since 2003. If there were anything special about them, I'd have noticed by now.
I've also had this discussion with another mountain bike rider who had the same complaint on his hydraulics which were a different brand. He also felt that the brakes were very touchy and grabby. To me, a brake that is touchy, grabby and requires a very light hand isn't an example of "good" modulation. It's just the opposite.
When adjusted properly, a hub mounted disc brake will have the same kind of lever pull that I run on all of my brakes. They have to or they don't function properly. If you detune a disc so that the lever won't engage like most rim brakes I've seen, the brake won't function. You can try it yourself. Put a lot of slack in the cable so that the lever doesn't engage until half travel and you'll find you can't stop.