@Mammmood - That’s a good point. The most important thing with any screwdriver that you use is the amount of torque, or circular force, that you can apply to it.
With a hex screwdriver you can use a T grip like the article talks about to generate more force – or you can buy hex screwdriver bits.
That’s what I have; I can attach them to my drill using a special attachment, and instantly I have more torque that I can deliver to the bolts. I can also reverse the drill’s rotation, too, in cases where I need to remove the hex bolts from something.