Hahaha! So, the Million Dollar question which always begs to be answered is this. Why is there an undeniable gap between form and function for so many martial artists of every style or system, since none of these fighting methods would have been preserved and perpetuated until now if they hadn't proven to be effective for at least a few practitioners in all previous generations?
I suggest that the gap is not necessarily the fault of the style's techniques or combat strategies, and is not necessarily due to the physical training or performance capability of any individual practitioner, but instead is the result of a failure to properly train the mind in order to reprogram the default mental/emotional responses and the default physical reactions in realtime fight scenarios when facing an aggressive, and perhaps angry, adversary who attacks with speed, power, and the intention to cause serious bodily harm or death.
Thus, without proper mind training, most fighters will revert to their lowest level of live combat efficiency prior to any martial art studies and training, as is clearly seen in most realtime fight videos, where only the most rudimentary techniques and skills are employed. Whatever was previously learned and practiced, regardless of style or system, is oftentimes nowhere to be seen in fighting on the street or in the pub.
The same thing usually occurs in competition bouts, where most fighters,
but not all, look like they train at the same MMA gym, using the same basic strikes, kicks, takedowns, throws, and grappling methods, devoid of any specific stylistic expression or any of the more sophisticated signature techniques of the styles they practiced prior to entering the ring.