I think the question is not "if" some people can on occasion, every now and then, pull off something that defies scientific explanation---mainly because nobody seems to be able to replicate it in lab conditions.
The real question, IMO is can it be RELIABLY??????
I'm guessing it can't, again, because of the inablity to replicate it, at will, in a lab.
To certain extent all martial arts are pretty much high risk-high return stratagies ie. kicking a man in the face is risky, but if you can pull it off--IF, it tends to end fights in a hurry.
(just an example---but in general, all arts balance risk vs possible reward)
In that sense the question becomes just how much your willing to risk on a given stratagy and a given technique.
I would not try to talk people out of exploring some pretty "out there" aspects of the martial arts--its there time and effort after all and they should be the ones that get to choose how they spend it.
By the same token I demand a pretty high level of proofs on anything they come up with.
Like I said, the real question--TO ME, speaking JUST for me here--isn't if people can do strange and terrible things with overlooked and underexplored aspects of the martial arts.
The real question to me is just how reliable such abilties are and can they be summoned at will.
And as of today, in the abscence of the abilty to replicate it at will--under the light stress of a lab test--let alone under the chaos of an actual attack--I have to judge such ablities as "unreliable"---and thus to high a risk for too little reward.
Again, could be wrong--have been before--and no doubt will be again.