Advance is about the capabilities of utilize the most of the human resources a human has.
It is an othogonal issues to technics…tan, swing, ground fighting… faking or real figthing.
capabilities of utilize as much as what a human has needed a methodology in mind/body/breathing to be cultivate or train. This has no contradiction to technics and different ways of application or style. But makes different technics more effective.
So, even the streching of Oyamas Kyokushing Idea, the no move is better then small move idea of Wang Xiang Zai,… etc.. ALL is a matter of training/seraching/streaching toward a both more effective and effecient process or result. Notice, it is a process of handling the human capability better. it has say nothing about the tactic or style but not exclude the tactic or styles…
People often mis-understood the search or working to strech of human’s potential with different dimentions to its ultimate as a magic or super nature. That is because one has tied one’s mind to view to box to define by oneself that fighting has to be in a certain way one view. Plane never get off ground if the view of only bird can fly is the only truth. Jet fly faster then the flipping wings…
The search of a more effective, efficient way of using one’s body/brething/mind is not denying about fighting but facing fighting as a reality to find different alternatives. that is a part of evolotion. similar to how flipping wings lead to invention jumbo jet .
It doesnt make sense to stop the alternative search and deny all the attainment of the past martial artists and deny all the existance by the name of fighting. The search and streching as Wang or Mas Oyama did has no blocking any kind of fighting method but will improve the fighting on the other hand.
As an example of what has done in the past.
in the ancient time, a tan sau is said to be a water shape hand with one other reason. That is when one does a tan sau, one has to feel an invisible water stream flowing from body toward the tip of the fingers. the fingers has to be closed so that that water stream focus forward. But there is an end of this flow since that is high tie and low tie of a flow. that is the time the tan execution completed---- low tie. so there is monitoring inward, outward, self and external influence — in this case the resistance of air.
SLT was view as no arm or hand but replace the arm and hand with an invincible water colon which flow with different angels flows of water out from the body and directed with mind. and ofcorse there are detail analysis of mind to be able to address what is the state of mind one desire to select and what state of mind one doesnt desire to get into.
fighting with flying limbs even thought constantly spoken about rooting or structure will be just a competing for speed ; for the body was never really being use. this is because most of those who says rooting is similar to tie the horse one rides on a pole and start fighting on top of the horse after the horse is stablely secured or ---- rigidly dead. there is a different with those who fight on top of the running horse.
So, the advance art is about fighting on top of the running horse. and it needs to have technology, methodology, and methods.
So, what is a tied horse? stop or force breathing. tunnel vision or dull mind or emotion reactive mind .., constant tense up body parts.
See, for most of us, doing SLT today is not about that invisible water colon flowing with different spiral or votex of flow.
Doing SLT today is about tied the “horse”. one jam one’s elbow. one dull one’s mind calling that focus. one force the tan to be this high this far. how is this become advance art? can polishing brick become glass mirror?
We even have so much fear to let go the tied 'horse" and using the name of “figthing” to in justified all others possibilities. However, when it comes to discussing fighting. then the MMA .. abc. xyz… all brought up.
on one way one advocate of WCK still doing SLT and has to do it MY SIFU GM X way GM Y way or Mr Z way. or WCK according to my sifu who is the best of WCK… on and on.
on the other way, when discussion figthing then one advocate MMA, just do it, fighting is for fighting…
But while searching into the different view of SLT and/or energy paradigm where others has accomplished in the past. That was voodoo… that was not true, the ancestors …
Isnt it that hypocrate?
Sure one can always argue that to fly one must needs a pair of flipping wings and dont you ever dare to fantasy of man flying.
one will never see a bird with jet enginee isnt it? and the 747 jumbo jet doesnt has a flipping wings so it cannot fly.
you like the flipping wings stuffs. that is fine with me. I like both flipping wings, jet propelling, and the super conductor anti-gravitation. and the list goes on. 
Those all just a different way of using energy. hahahaha.
Why fighting has to be in one way? doing ten thousand wings flipping will not fly faster then a Jet plane. so keep up your flipping wings flying.
The evolution of WCK is multi-dimentional. and the investigation or search on a better more effective, efficient way or using or manupulating energy is not an optioin but a must.