Actually, I do discount things like finger strikes to the eyes, with a few exceptions. The problem is that they're a lot more difficult than it would seem, and carry significant - near certain, in some cases - risk to your hands. Get out your BOB dummy and see if you can actually stick your finger into his eye with both speed and accuracy. Then add in some force and see how long it takes for your fingers to approach the level of injury. Now imagine you're suffering under the effects of an adrenalin dump, and that your opponent is actually capable of movement. It's just not very realistic. (The same, in my experience, goes for any technique requiring significant precision and/or fine motor control. It might seem cool in the dojo, with a compliant training partner, but inject enough stress and reality and it turns into a joke.)
Beyond that, it is not enough to just do your opponent mild or moderate damage. In a lethal struggle, it's possible if not likely that such injuries will have no impact. In a real fight, you can only count on winning through major structural damage, or significant impact on the CNS. Teaching people that they can just whack somebody with a phone - or a deck of cards - and then go home safe... It may indeed happen just that way, but I wouldn't count on it.
Beyond that, I think I'm done here. This all strikes me as perilously close to "Destroy your opponent with this one secret trick" business and I'm not sure why I've spent so much time debating it.
Yes, even in my early training I was required to learn how to demonstrate speed and accuracy in striking vulnerable anatomical spots (did I only/specifically say eyes?), and it was done having to train on moving targets, as well as training on the usual materials to toughen fingers and hands (beans, sand, sisal rope-wrapped wood, shaped wooden surfaces, etc).
Another critical part of the training was learning how to control the force used that reached to/into the target/attacker, meaning attempting
not to cause more injury than was necessary to defend yourself. (And not striking wrong so that you injured yourself.) Training & practice, training & practice ... then more training & practice. Sure, most people have neither the interest, time, money or access to training to achieve that sort of long term goal.
Also, obviously (you'd hope it was obvious) not every application of defensive force has to be 'devastating', 'lethal, 'deadly', etc. Reasonably adequate and sufficient to the circumstances, yes ... excessive, no, especially when you consider that your actions are likely eventually going to be subjected to intense and lengthy review and discussion (and nobody in their right mind wants that to involve a jury of their peers reviewing and discussing their actions because they found themselves at the wrong table in a court room
).
Back track for an example I've previously mentioned. During some later 'defend your gun against a takeaway' DT training, I was paired with a guy who was younger, taller, heavier and stronger than me. Of course. When he came at me to grab my holstered 'gun' it didn't take much force, delivered via a 'soft' finger push/strike against the base of his throat, to cause him to gag/choke and rapidly grasp his throat with both hands, and lose all immediate interest in going for my 'gun'. He didn't even know what had happened. He barely had a rapidly fading red spot on his skin, but boy did it cause his 300lbs to reverse course even faster than he'd moved forward. Granted, he was a lot easier subject to do that to, in a classroom, where I was using very minimal effort ... than the dogs against which I'd had to use my hands and fingers while defending against their attacks in real life.
Of course finger strikes create potential risk to fingers ... just like striking with a clenched fist can create the potential risk of breaking bones in the hand, or the wrist. Even training can only help mitigate some of the risk, especially in a dynamic, chaotic set of conditions. Hence, practical and controlled training done until you believe (hope) you've achieved the amount of skill you feel adequate to the task for yourself. Much easier to use an object to poke, strike or prod an anatomical spot that creates the reaction you
reasonably believe necessary to defend yourself. Even the edge of a cellphone. (Wouldn't be my first choice, but it was subject mentioned ... and look around at how many people always seem to have one seemingly 'attached' to their hand nowadays.
) Especially at close range, meaning within arm's reach - or closer - when you've been unable to gain distance (get away, etc.) and you're at immediate risk of serious bodily injury or death.
You know the old training maxim that if all you have is a gun, then every problem starts to look like the gun is the only 'answer'? That does seem to have some merit in the larger picture, and it's not like there's been a particular shortage of otherwise intelligent, honest law-abiding folks who resorted to going to their gun to quickly, and then finding themselves on the wrong side of the law. Hell, it's been happening to cops at an increasing rate in recent years. Who wants to start seeing nails everywhere because all they have at their disposal is a hammer.
Now, I no longer subject my hands to
that sort of toughening regimen. Age, and the desire to prolong dexterity and the pain-free use of my hands, makes that a priority. I'm not as fast as I was as a younger man, either. (Who is?) I still continue to practice the training, albeit without the brutal impacts to my hands & fingers (and other tired and well-worn connective tissues and joints), or that the coordination and reflexes have rusted away to nothing.
Even so, if I happen to have a cellphone (or pen, or one of my cane/walking stick collection, etc) in hand when/if trouble comes calling, at unavoidable close entanglement distance, I'd be much more inclined to use whatever was easily and immediately at hand, in the most appropriate manner. If that allows me to gain a little distance and time to grab my retirement gun, should it be needed? Okay. If poking/striking with a cellphone (or whatever expedient thing is at hand) resolves the threat? Okay. It doesn't have to look cool, tactical or worthy of being a vision of someone's fantasy inspired by a JW movie. It just has to work and be sufficient for the moment (reasonable, necessary, etc).
Do we really disagree? I didn't think so.