You’re mixing too many things at the same time here
It was known for a long time that getting hit in the head isn’t a good thing
Term “punch drunk” been around for a long time n it refers to boxers who have been hit too many times n they had slurred speech or showed signs of Dementia
There’s also Ali n his Parkinson disease was believed to be linked to his boxing career
Everybody’s pretty much aware that blows to the head are not good n can cause neurological problems later on
As fighter you gotta accept these things n be aware that fighting might lead to brain/head problems later on
If you’re concerned with these issues then fighting career isn’t the best path
Tapping to strikes to avoid couple of extra punches isn’t gonna change much in a long fighting career where a person is gonna get hit to the head over 1000 times
It’s like going to the Vegas n losing 10000$ In casinos but then getting upset for spending 100$ in a strip joint n acting like the reason you have 10100$ less in your bank account is the strippers
Also like somebody else already mentioned if your hands are free to tap, you can do something else instead. Try to improve your position, block, tie the guy up ...
In a sub you’re stuck. You can move try to escape, but when the sub is deep you know it n it’s either you’re gonna go to sleep or get your limb broken. The ref will not step in after you’re out/have broken limb
With strikes the ref will step in before you go completely out.
Another thing with tapping is you’re not protecting yourself. You give your opponent an opening to hit you without you protecting yourself.
You’re better off covering up n protecting yourself n let the ref step in then tapping n letting your opponent hit you straight in the face with no protection
It was thought that it took a large number of head strikes (as in years of accumulated strikes) to cause damage. Which is why it was thought okay even for kids to be knocked out several times in a single hockey game - the understanding was that it'd take years for the KO's to add up to a problem. Even protective parents would tell their kid to get back on their feet and be on the ice the next shift, because that was accepted medical knowledge.
Its the same theory that says getting hit four or five more times when you're already going unconscious from brain trauma isn't a problem - the additive factor of individual strikes was thought to be minimal. Unfortunately we now know better, and in fact taking a hit when you're already concussed (ie going unconscious) has a significant multiplier affect on the severity of damage.
I agree that a fighter has to be aware and accept this. I just don't see how that's any different than saying a fighter has to be aware and accept being choked out or having a broken limb from not tapping - if the idea is you never give up, then its just as reasonable to tell a fighter to refuse to tap given the risk a broken limb or being choked out as it is to tell them to risk increased brain damage.
You're stuck in sub, but there's always a non-zero chance of getting out. Your opponent might screw up; its why in old time judo you never tapped, not for chokes, not for arm bars. It was considered unmanly to tap rather than accept a broken arm or torn knee (knee bars were part of judo til 1925). My first judo coach was from that era of judo, and he'd frown at any of his students to tapped rather than accepting a torn limb, and for the same reason that you frown at a fighter who taps because of strikes. He'd say there's always a chance, bushido meant never giving up. In retrospect I think he's wrong, and I think you're wrong for the same reason ... counting on your opponent to screw up, or for the referee to see that your arm is bending unnaturally or that you're going unconscious is relying on another person to save you ... its telling you you're a victim who needs a ref to keep you from serious harm.
Have you ever gone unconscious from a head blow (or blows), and gone unconscious from a choke. I have from both (putting a head through a windshield is not something I'd recommend if you want to try it - lots of bleeding along with the concussion). You really have no more control of your body with the head blow than you do the strike.
Sometimes I get the feeling you're talking about fighters tapping while completely conscious, just because they don't like getting hit, the equivalent of someone tapping because someone has a very loose choke or armbar on. Panic tapping (you see it in judo with beginners, and I'm sure in amateur MMA). But that's not what's happening at the UFC level. Guys tap to armbars because their arms are bending, guys tap to chokes because they're going out, guys tap to strikes because they're going out.
And when you're losing consciousness you have no more ability to protect yourself from a strike than you do from a choke - the tap is a reflex at that point, the hand does it by itself (again, speaking from plenty of experience with chokes, mine and others).