The too much torque is just something that is hard to control, a M4 screw only gets torqued to a few ft-lb (I know, unit mixing), so it's so easy to over torque without even trying. The Hex design doesn't scale down well to handle this. TSO is right to not want to offer something that lets people good a good wrenching on it.
An M4 screw with torx takes a T-20, this is what we use on impact drivers putting in wood screws. It's a big difference, you won't damage the screw easy.
Obviously anything is better than a flat or a Phillips, but now, even hex/allen is a bit annoying verses a torx/star.