One thing that makes performance wushu inneffective in combat is that it is encouraged to hyperextend the limbs.
In combat, this is a no no of the major category. Never hyper extend. It looks great on floor gymnasts and wushu gymnasts but it will get yer limb busted in a for real go.
Modern competitive wushu does not have martiality as it’s focus.
And it can be said that anyone who thinks that it has martial applicatiuons is in for a rude awakening when they try to use it as a combative.
The focus is on higher leaps, artistic expressiona dn gymnanstic skill. The focus is NOT on martial applicability. The whole purpose of the invention of wushu in the PRC of teh seventies was to give the chinese people some reasonable facsimile of the beloved martial arts that are ingrained into their culture without giving them the ability to use the martial aspects which is a threat to the communist government and it’s local bureaucrats.
imagine, a vilage of people thoroughly trained in a true martial art? That would not bode well for local officials when the try to impose their wills on the folks would it? And that’s what Mao and his cronies were thinking when they gave this to China as teh national sport. Since then, it has becoma na art form and the traditional Kungfu is sometimes taught alongside so that those who do wushu that want to explore true martial arts can.
of course the inventors of it had to draw from the real arts. How would they be able to sell the idea to the people? And so, during the 1970’s they busted out the new martial arts for china and ping pong fell as the national art (kuo shu). IN the 1990’s, the curriculum was revised again to include some southern flavour and it was standardized into the performance routines we see today.
All these performance routines are practiced and preformed in exactly the same way with the emphasis placed on performance and not on martial applicability.
Masters of traditional martial arts fully recognize the differences between the two and the masters are not afraid to make these deliniations when they teach.
they will ask, what do you want to learn? this or that? sometimes, some students want to learn both and in the west, you can learn both a traditional and martially applicable art and you can learn the contemporary wu shu.
Contemporary wu shu actually borrowed heavily from the northern style Cha Chuan because of its large movements and specctacular kicks. I would say that in a western tournament, a Cha Chuan stylist or a Bak Sil Lum stylist could give a wushu stylist a run for their money in the looks of the form.
But I have to say that a 720 or a 540 aerial crescent kick is absolutely the most useless thing you can bring to a fight. UNless of course you are fighting a catatonic 
You would be luckly to get away with a 360, and in many cases, even a 180 crescent kick is difficult to pull off in a for real fight without massive ability and training.
anyway, it is what it is and it has value as what it is. Don’t try to sell it as something else, the masters don’t so why are you?
cheers