As long as they're functional, that's the important part.

[ Well, he would prefer not to look completely ridiculous too, but he doesn't need the design to be that fancy. Extra spells just mean extra resources.

He looks at his hand. Is manipulating cursed energy a mental power? ]

I suppose in a way. It requires concentration and practice to fully control a technique. It's still connected to the energy that runs through a sorcerer's body, so it isn't completely dependent on our mental control. It's a combination. A fighting style that develops around our innate abilities. A sorcerer can learn to pull greater amounts of cursed energy into more complex techniques, just like you can learn to use a sword or hone your accuracy when aiming at a target.

[ And then it gets even crazier when the special techniques are involved, but he's not that strong. ]