As for the answer yes there are attacks where you have to be highly skilled to pull it off or pull it off with any sort of effectiveness.
You think someone is going to train for a week and snap swords with a sai? Is it an essential skill? Also a yes.
Some weapons are also known to be very difficult to use unless you are particular good at them. Most flails are like that and have more then enough ability to harm the weilder.
Some of the more flashy swordmen attacks are built for more then one opponent. They are mostly herding techniques made to prevent the swordsmen from simply being overrun by more then one opponent. There are also attacks that were created to allow the swordsmen to attack from different possitions that may arise.
You need to sort of step out of the box of "1 on 1 flat surface duels with similarly armed opponents" to see anything more then utilitarian straight forward attacks. Mind you they arn't jumping off the walls, but it is a change.
There are also flashy attacks that are also effective as well (Hookswords are full of utilitarian awsome)
I just wanted to avoid some of the flashier 'hollywood style' of combat that emphasizes highly visible attacks over functionality
On the contrary highly visable attacks are a battle strategy and often part of battle philosophies. SURE you probably could just punch someone in the neck and kill them rather quickly that way. If you can somehow rip out their throat in the process then you can demoralise your opponent.
Or less brutally, if you can fight in a way that makes your swings look effortless, then others may be more cautious when challenging you.
Then there are attacks made for demonstrations but that carry little battle use. It is for the popularity of the martial art as well as the above. (Even Boxing has some of these)
There are many reasons why many martial arts including weapon arts carry on attacks that are not quite as effective. Another is that they became part of the martial art itself especially with martial arts made to emulate nature such as animals.
Some are a bit more flashy due to missing elements. Some of the movements in martial arts made much more sense when weapons were involved.
I can even go on as to mention Drunken Fighter where the martial art is more based around throwing your opponent off balance. It would likely be a lot less effective against anyone who knows the martial art.
Though then you get Ki, Magic, Force involved and everything changes... but that is different.