Flashy kicks are awesome, even if predictible, it's always fun to see acrobatic moves it in sparring. Not optimal for self defense, but very nice in a sport context :)
Well it all depends on the skills of the user. If these kicks where not practical they simply wouldn’t be taught and discarded in most martial arts (even Aikido use them “secretely”! 😁) Kicks can be extremely useful in self defence but again, as in everything you need to set the situation otherwise even hand to hand techniques are pointless
I think if you take away the acrobatic and fancy moves the rest is pretty legit! A lot of those moves would do pretty well in self defence or sparring/competition as I’ve been inspired too specially by the karate practitioners with some combos. Have to say that in most case though, a lot of those techniques if applied in self defence would be more a manslaughter against a non martial artist than self defence as they are pretty brutal and aim for permanent damage