Here we go again....
One - anything entering the eye oroface will hurt an opponent, whether that be a finger, a knuckle, a toe, or whatever.
Two - The idea of using a stiff pointed spear hand as it is traditionally trained is not necessary however, nor is it necessary to dig your hands in hot woks of sand to be able to do it.
A proper finger jab, in reality, is done normally like a palm--but with the palm slightly pitched forward and the fingers slightly bent. If you miss...there's no damage to the fingers.
Kinda like what SR describes here but with the thumb...huh...go figure.
SR
I can identify with what the guy's doing...I normally fight with my strong side in front, but after breaking my wrist which resulted in non-union, I now have to switch with my weaker side in front because that is the side with the (now) even weaker wrist which can no longer take the brunt of hitting with power shots. Now I just use it to jab for the most part.
You always have to adapt and overcome.
"I don't know if anyone is known with the art of "sitting on your couch" here, but in my eyes it is also to be a martial art.
It is the art of avoiding dangerous situations. It helps you to avoid a dangerous situation by not actually being there. So lets say there is a dangerous situation going on somewhere other than your couch. You are safely seated on your couch so you have in a nutshell "difused" the situation."