General observations on the martial arts and attacks:
Martial arts at their core is not about fancy moves or studying for 30 years to block arrows. It's all part of them but not the definitive. The main things are perfecting oneself and making your opponents to lay down as fast and effective as it is possible and with minimum work needed.
The second part is the one that is mostly relevant to Dwarf Fortress. The "sad" thing is that this part rarely includes some fancy moves or stances. You meet your opponent place 3-4 strikes to vital spots and thats it. Attacks used will mostly be short, fast and direct with some occasional feint. You simply won't have time for some fancy moves then one strike to the skull, throat, joint or family jewels can lay an end to your ability to fight and maybe even lay and end to your life.
Attacks used will be exerting as much force as can be possible in one strike while minimizing energy requirements. Most attacks will include whole body movement - footwork, turning torso to add range and impulse and the actual hand or leg strike as a pinnacle of the move.
Fancy moves while involving all the same parts have one problem - they are slow or have some other big drawback like rigid stance which harms your ability to maneuver. It may have great power but if you can't adapt to the situation or opponent can make 2 attacks while you make 1 (and it's hard to defend in the middle of your own attack) you lose. This is not so obvious in the sport cause most attacks which can easily end a real fight are prohibited.
Not quite sure what fancy moves your talking about but most moves in Martial Arts, even the awkward and hard to learn techniques, have their purpose and circumstance to use them in. For instance, an axe kick is highly awkward to use, requires the user to be flexible and leaves the user open to a counter attack or grab. However, an axe kick is powerful thanks to gravity, and hard to see coming (most people defend against kicks to the groin, shins or belly), meaning it can be used against opponents who are tired, surprised or unprepared.
The problem with dwarf fortress is it does not simulate a real fight effectively, such as the fact that your attack is going to have to go through the other persons arms (when prepared) to hit anything vital, or that a person's vital organs are going to be the most heavily armoured.