Uneven torque can definitely cause warped rotors. How much tolerance do you have before it becomes enough uneven torque, I don't know.
If I were to use my hand torque method on a race car that were driven to the point of red rotors, I wouldn't want to use my method. But for my moderately driven 123 car it's worked great. I guess I now have to do some testing to see just how even I'm torquing them with my method. I expect that I'm torquing them within 5 or 10 pounds of each other.
Proposing my hand torque metod is not in any way a statement saying that you shouldn't torque them carefully with a torque wrench. That is obviously the safest method. I'm just relating my experience regarding what has worked well for me.
Have a great day,