While a level of suspension of disbelief is required when enjoying any form of fantasy/scifi, there does need to be a certain level of realism in order to make it not too unbelievable for the audience. Blaster guns, lightsabres and Force powers are arguably fictitious, but this doesn't mean that there can't be a level of realism within the fantasy. IMO, that level of additional realism helps to make the fantasy more enjoyable, as it helps to ground it and just make it more believable. If you're going to leave yourself open in a fight, then you're making just too easy for the enemy to attack you. Enemies who are trained (or should be trained) to kill you as soon as you make an opening.
Examples of fantasy/scifi genre films with realistic fight choreography include:
* The Lord of the Rings
* The Hobbit
* The Chronicles of Narnia
* The Original Star Wars Trilogy!
etc.
All of these fights portray the brutal savagery of combative fighting. There's none of this nonsensical grandstanding or "peacocking" where you're just trying to make the characters strike dashing (but stupidly exposed) poses or fancy acrobatic or gymnastic movements that would just get you killed in a real fight. Many good fiction writers realise the importance of grounding their work in realism. Sir Arthur Conan Doyle even invented a fictitious martial art for his titular character!
Tyred of realism?
^That's basically how Jedi & Sith fight. The only reason why some light sabre fights go on longer is because they're up against highly skilled opponents (e.g. other Force users, Bounty Hunters etc.). But you look at the average non Force user against a Force user, and it's typically a quick fight. Look at Palpatine vs the Jedi Masters; he kills Agen Kolar and Saesee Tiin in precisely the same manner that you've just described. Kit Fisto falls shortly after, and only Mace Windu is able to hold up against Palpatine. That's precisely how real combat works.